Galen’s Blog

 

Moose Movement in Relation to Roads

Mathematics
Statistics
Movement Ecology
Road Ecology
Wildlife Ecology
Resource Selection
Step Selection Functions
Hidden Markov Models
Stochastic Processes
Moose
Literature Review
A moose that walks onto a highway is a public-safety problem, a conservation problem, and a modelling problem all at once. Because a moose has a high centre of mass and…
Oct 16, 2026
Galen Seilis
 

Indivisible Stochastic Processes and the Stochastic–Quantum Correspondence

Quantum Mechanics
Stochastic Processes
Probability Theory
Foundations of Physics
The standard formulation of quantum theory rests on the Dirac–von Neumann axioms: states are vectors (or density matrices) in a Hilbert space, observables are self-adjoint…
Oct 15, 2026
Galen Seilis

A General Fokker-Planck Model of Moose Movement

Mathematics
Stochastic Processes
Fokker-Planck Equation
Fractional Diffusion
Nonlocal Interaction
Movement Ecology
GPS Telemetry
Moose
Python
In the previous post I built the Ornstein-Uhlenbeck (OU) model of a moose with a home range, and ended with a list of nine defects and a promise: rebuild the model in the…
Oct 14, 2026
Galen Seilis

The Ornstein-Uhlenbeck Model of Moose Movement

Mathematics
Stochastic Processes
Ornstein-Uhlenbeck Process
Fokker-Planck Equation
Langevin Equation
Diffusion
Mathematical Biology
Movement Ecology
GPS Telemetry
Moose
Rust
Python
In a previous post I used ellipses to put hard bounds on where a moose could have been between two GPS fixes, assuming only a maximum possible speed. That approach answers…
Oct 13, 2026
Galen Seilis

Ellipse Intersections and Locating a Moose Between Fixes

Mathematics
Geometry
Computational Geometry
Python
Shapely
Wildlife Ecology
Movement Ecology
GPS Telemetry
Moose
Time Geography
A GPS collar on a moose hands us a sequence of points: a latitude, a longitude, and a time. What it does not hand us is the path between those points. Between two…
Oct 12, 2026
Galen Seilis

Python Module Imports Can Pass Data Too

Python
Modules
Modular Programming
Programming
Ruff
Dependency
Language Server Protocol
LSP
This is kind of obvious, but I think it is often skipped over for more complicated solutions: you can pass data from module-to-module using imports. This approach to modular…
Jun 15, 2026
Galen Seilis
 

Farsi in Quarto

Farsi
Persian
languages
Hello there. My name is Galen. I translated this text using Google Translate, so you have my apologies for any errors.
Jan 6, 2026
Galen Seilis
 

Installing Anki on Ubuntu 24.04.2

Anki
Ubuntu
Linux
Installation
This post quickly covers how to install Anki for Ubuntu.
Feb 24, 2025
Galen Seilis
 

The No Road Fallacy of Mathematical Symmetries

Mathematics
Symmetry
Observational Equivalence
Philosophy
Philosophy of Science
Isometry
Logic
Fallacy
Logical Fallacy
Suppose we have two cities \(A\) and \(B\) which we represent as two vertices of a graph with two parallel edges representing two distinct roads between them.
Feb 21, 2025
Galen Seilis

Word Adjacency Graph of Rolling Down to Rio

Art
Music
Word Adjacency
Here are the lyrics of Rolling Down to Rio with punctuation and capitalization ignored:
Feb 19, 2025
Galen Seilis

Word Adjacency Graph of Rossetti’s Silent Noon

Art
Music
Word Adjacency
Here are the lyrics of Silent Noon with punctuation and capitalization ignored:
Feb 19, 2025
Galen Seilis

Word Adjacency Graph of The Little Irish Girl

Art
Music
Word Adjacency
Here are the lyrics of The Little Irish Girl with punctuation and capitalization ignored:
Feb 19, 2025
Galen Seilis
 

Kedro Video Tutorial Notes

Python
Kedro
Docker
Data Science
ZenML
Cookiecutter
MLFlow
Intake
DVC
Pachyderm
dbt
plugins
Mamba
Jupyter
Notebooks
Pandas Vet
Pandas
Polars
Pipelines
Kedro Viz
Versioning
Data Versioning
fsspec
Deployment
Best Practices
Problem of Induction
Pareto Front
Tradeoffs
These are my notes on a video series released on Kedro. I started these notes quite a while ago, but I only just got around to finally finishing them.
Feb 17, 2025
Galen Seilis
 

How to Set Keyboard Bindings to Programmer’s Dvorak on Ubuntu Using setxkbmap

Ubuntu
setxkbamp
Dvorak
Keyboard Layouts
Changing over to programmer’s Dvorak on Ubuntu is really easy:
Dec 11, 2024
Galen Seilis

Why Averages Can Be Bad For Resource Allocation

Statistics
Poisson Distribution
Expected Value
There are some upsides to using averages for resource allocation, but in this post I want to focus on some of the often-ignored or discounted downsides of using averages for…
Sep 14, 2024
Galen Seilis
 

A First Prototype of A Simple DES Environment in Rust

Rust
Discrete Event Simulation
Simulation
Software Design
Prototyping
In this post I explain the current state of the prototype for a discrete event simulation (DES) environment I created in Rust.
Sep 1, 2024
Galen Seilis
 

Hello World, in FastAPI

Python
FastAPI
This is a quick post showing how to create a “Hello, World” example in FastAPI.
Aug 21, 2024
Galen Seilis
 

Running A Kedro Project With An HTTP Request Via FastAPI

Python
FastAPI
Kedro
HTTP
HTTP Requests
This post gives a minimal (but not production-ready) example of using FastAPI to run Kedro projects with parameters specified by HTTP requests. Although in this example I…
Aug 21, 2024
Galen Seilis
 

A State Diagram of a Simple Healthcare Service Using Mermaid

Mermaid
Healthcare
Queueing Systems
Here is a simple diagram representing a healthcare service. This diagram can be used for communicating with clients about the basic structure of queueing systems.
Aug 10, 2024
Galen Seilis
 

Calculating the Greatest Common Divisor in Rust

Rust
Mathematics
Greatest Common Divisor
I recently learned that Rust does not have a greatest common divisor function. See Anonymous (2020) to read some discussion about it.
Aug 9, 2024
Galen Seilis
 

Build and Run a Zig Project from Quarto Using Python

Zig
Quarto
Python
subprocess
In this post I share a way to compile and run a Zig file using Python, which in turn can be used to render the output of the Zig program in Quarto.
Aug 9, 2024
Galen Seilis
 

evcxr_jupyter provides Rust execution in Quarto

Quarto
Rust
evcxr
evcxr_jupyter
Jupyter
Jupyter Notebooks
I recently learned that setting up Rust execution in Quarto is easy via evcxr_jupyter.
Aug 8, 2024
Galen Seilis
 

Rendering a Dot Representation of a Graph in Quarto Using Petgraph and Petgraph-evcxr

Rust
Petgraph
Petgraph-evcxr
Dot
In this post I want to quickly showcase the use of the Petgraph and Petgraph-evcxr packages. Petgraph is a popular graph data structures and algorithms crate available for…
Aug 8, 2024
Galen Seilis

A Rust Implementation of the Poisson Binomial Probability Distribution

Rust
Statistics
Poisson Binomial Distribution
Probability Mass Function
Cumulative Distribution Function
The probability mass function of the Poisson binomial distribution (Wang 1993) is given by
Aug 8, 2024
Galen Seilis

How to Naïvely Generate Autoregressive Time Series Data in Python

Python
Statistics
Stochastic Processes
Autoregressive
Time Series
Matplotlib
NumPy
In this post I will show you how to simulate an autoregressive (AR) process using Matplotlib and NumPy.
Jul 31, 2024
Galen Seilis
 

Hello World, in Asyncio

Python
Asyncio
subprocess
Asynchronous Programming
Concurrent Programming
We can define a “Hello, World” type of example using Asyncio as follows:
Jul 30, 2024
Galen Seilis
 

A Mermaid Diagram of Bayesian Workflow

Mermaid
Bayesian Workflow
Bayesian Statistics
Bayesian Inference
Bayesian Probability
Bayesian Modelling
Prior Probability
Posterior Probability
Modelling
Model Development
In this post I visualize the Bayesian workflow introduced by Gelman et al. (2020).
Jul 30, 2024
Galen Seilis
 

Build and Run a C Project from Quarto Using Python

C
Quarto
Python
subprocess
In this post I share a way to compile and run a C file using Python, which in turn can be used to render the output of the C program in Quarto.
Jul 30, 2024
Galen Seilis

The Statistical Assumptions of Quantitative Fault Trees in Se-Lib

Python
Systems Engineering
Se-Lib
Fault Tree
Probability
Assumptions
Statistical Independence
Disjoint Sets
Pairwise Disjoint Sets
Almost-Sure Pairwise Disjoint Sets
The se-lib (Systems Engineering Library) offers a variety of diagrams that simply take in tuples of strings and numbers. In this post I want to discuss their quantitative…
Jul 30, 2024
Galen Seilis
 

Basic Error Handling In Flask

Python
Flask
Web Applications
Error Handling
Flask provides support for error handling, including defining custom errors. When an error occurs which is not otherwise defined, the default error code is 500 (internal…
Jul 29, 2024
Galen Seilis
 

Fetching from a URL and Displaying an Image Using Flask

Python
Flask
Web Applications
URL
Requests
Images
In this post I am going to show a Flask application which takes an integer and searches the Magic the Gathering database for an image of a corresponding card whose…
Jul 29, 2024
Galen Seilis
 

Dynamic URLs in Flask

Python
Flask
Web Applications
URL
In a previous post I showed how to start the most basic Flask web application. In this post I show a dynamic URL which renders content that depends on using the URL as user…
Jul 29, 2024
Galen Seilis
 

HTML Templates in Flask

Python
Flask
Web Applications
URL
HTML Templates
In this post we will not only have dynamic URLs, but start loading HTML templates. In the last post I wrote on Flask I used the factorial function. In this post we’ll take a…
Jul 29, 2024
Galen Seilis
 

HTTP Methods in Flask

Python
Flask
Web Applications
URL
HTTP
HTTP Methods
The hypertext transfer protocol (HTTP) is a way for a web application to respond to requests.
Jul 29, 2024
Galen Seilis
 

Creating a URL using url_for in Flask

Python
Flask
Web Applications
URL
In this post I quickly show how the url_for command allows us to generate URLs. It isn’t a fundamental feature, but it can save you some boilerplate.
Jul 29, 2024
Galen Seilis
 

Hello World, In Flask

Python
Flask
Web Applications
This post shows a relatively minimal example of using Flask to develop a web application. This application will only run locally, but it is otherwise a bona fide web…
Jul 29, 2024
Galen Seilis
 

Build and Run a Rust Project from Quarto Using Python

Rust
Quarto
Python
Cargo
rustc
In a previous post I used a Lua extension to compile a Rust file using the rustc compiler. I ran into multiple problems.
Jul 29, 2024
Galen Seilis
 

Executable C Code in Quarto

Quarto
C
Lua
Pandoc
I have turned off the Lua filter discussed in this post. It was running every time I rendered/published the blog. I have copy-pasted the original output for reference.
Jul 28, 2024
Galen Seilis
 

Executable C++ Code in Quarto

Quarto
C++
Lua
Pandoc
I have turned off the Lua filter discussed in this post. It was running every time I rendered/published the blog. I have copy-pasted the original output for reference.
Jul 28, 2024
Galen Seilis
 

Executable Rust Code in Quarto

Quarto
Rust
Lua
Pandoc
I have turned off the Lua filter discussed in this post. It was running every time I rendered/published the blog. I have copy-pasted the original output for reference.
Jul 26, 2024
Galen Seilis
 

How to Compile CPython on Debian-Based Linux

Python
CPython
C
compilation
make
Debian
Linux
This is a short blog post to remind myself how to compile CPython from its source.
Jul 25, 2024
Galen Seilis
 

My Quarto Blog

blog
Quarto
Jekyll
Mermaid
Graphviz
dot
I am switching to Quarto for my blog. My Jekyll blog is available here, and I might move some of the posts over to the new blog over time.
Jul 21, 2024
Galen Seilis
 

Combining Kedro with Rye

Kedro
Rye
Python
Project Management
Package Management
I recently asked on the Kedro Slack channel about what experience people have had with combining Kedro with package management tools in Python such as PDM, Poetry, Hatch or…
Jul 1, 2024
Galen Seilis
 

Expressing the Agnesian Equation of Order One of the Lorenz System Using SymPy

Python
SymPy
This post shows how to use SymPy to express the Agnesian of order one \(\mathcal{A}_t^1\) of a system of ordinary differential equations. See Seilis 2022 for a description…
Jun 17, 2024
Galen Seilis

Sampling from a Linear System of Random Ordinary Differential Equations Using Scipy

Python
Statistics
Random differential equations result when some combination of parameters in the rate equations or the initial (or boundary) conditions are random variables. Combining the…
Jun 17, 2024
Galen Seilis
 

SymPy Supports Compound Distributions

Python
SymPy
Statistics
Compound distributions allow us to compose probability distributions together. In other words, it allows us to have parameters in our model that are themselves random…
Jun 17, 2024
Galen Seilis
 

Paul Grogan’s DES Example and Its Implementation in Ciw

Simulation
Discrete-Event-Simulation
Python
Ciw
I watched a YouTube video over a year ago that showed an implementation of a specific discrete event simulation. Here is the video:
Jun 13, 2024
Galen Seilis
 

A Ciw Implementation of SimPy’s Movie Renege Example

Simulation
Discrete-Event-Simulation
Python
Ciw
This post provides an implementation of SimPy’s Movie Renege example. In this implementation I subclassed three times. One class is TicketArrivalNode which replaces the…
May 9, 2024
Galen Seilis
 

A Poem of Causality

Art
Poetry
A black distortion on a yellow puff,
Mar 11, 2024
Galen Seilis
 

A Generalization of the d’Alembert Operator

Math
Operators
Differential-Operators
Dalembert
According to one of my old notebooks, I came up with a generalization of the d’Alembert operator between 2022-03-27 and 2022-05-20. I can’t say that it was well-motivated by…
Mar 3, 2024
Galen Seilis
 

The Probability of the Minimum of X Being Greater than the Maximum of Y

Statistics
Probability Distributions
Derivation
Change of Variables
Transformations
Stochastic Orders
Identical and Independently Distributed
Random Variables
Statistical Independence
Smooth Functions
Minimum
Maximum
Probability
Order Statistics
Convolution
Convolution Theorem
Fourier Transform
Suppose we have a collection of IID random variables \(\{ X_1, \ldots, X_n \}\), and we also have a second collection of IID random variables \(\{ Y_1, \ldots, Y_m \}\). Each …
Mar 2, 2024
Galen Seilis
 

A Quick Reference to Some Common Orders

Math
Order-Theory
This post is just dumping a short list of notions of order from my MSc thesis days.
Feb 27, 2024
Galen Seilis
 

Notes On Laszlo Sragner’s PyData Talk On Code Smells

Python
Data-Science
This post is my notes from the video Laszlo Sragner - Code Smells in Data Science: What can we do about them? | PyData London 2023. I don’t necessarily agree with all the…
Feb 25, 2024
Galen Seilis
 

Which Scikit-Learn Models Have Built-In Uncertainty Quantification?

Data-Science
Machine-Learning
Python
scikit-Learn
Uncertainty quantification is a valuable thing to have when modelling noisy data. We need to make decisions and it can make a huge difference having estimates of the worst…
Feb 25, 2024
Galen Seilis
 

Pareto World

Art
Music
Lyrics
This is a song I asked ChatGPT to write about Pareto fronts sung to the lyrics of Gary Jules’ “Mad World”. Here is the original song just to put the tune in your head.
Feb 21, 2024
Galen Seilis
 

A Ciw Implementation of SimPy’s Machine Shop Example

Simulation
Discrete-Event-Simulation
Python
Ciw
The following is an implementation of the machine shop example from the Simpy documentation using Ciw. Parts of this implementation came from this post.
Feb 20, 2024
Galen Seilis
 

On Thoughts and Feelings Along With Their Meanings

Valentines-Day
Poetry
Some years ago a person I care about wrote me a poem about thoughts and feelings, and of their meanings. I’ve put down some words in response below.
Feb 14, 2024
Galen Seilis
 

Plotting Ciw’s Café Example As A Sankey Diagram Using Plotly

Simulation
Discrete-Event-Simulation
Python
Ciw
In this post we’ll run the café example from the Ciw documentation, collect the results, and display them as a Sankey diagram.
Feb 10, 2024
Galen Seilis

A Sankey Random Walk with Matplotlib

Python
Matplotlib
Sankey-Diagram
While looking into programmatically generating Sankey diagrams based on the results of discrete event simulations I made up a somewhat absurd programming exercise. Using matp…
Feb 10, 2024
Galen Seilis
 

A Generalization of Subindependence

Mathematics
Mathematical-Statistics
Subindependence
I was contemplating the notion of subindependence. It states that for two random variables on a shared probability space that the characteristic function of their sum is…
Feb 9, 2024
Galen Seilis
 

Reaching for the Last Pandigital Factorial Number

Mathematics
Number-Theory
This post is for a dear friend. Many years ago I shared with him a mathematical puzzle that we both enjoyed. Later I posted What’s the next base-ten non-pandigital factorial…
Feb 6, 2024
Galen Seilis

A Ciw Implementation of SimPy’s Bank Renege Example

Simulation
Discrete-Event-Simulation
Python
Ciw
In this post we look at implementing SimPy’s Bank Renege example using Ciw. At a first glance this example is essentially an M/M/1 queue, but it has a couple of custom…
Feb 2, 2024
Galen Seilis
 

A Python CLI Example to Log the Execution Trace

Computer Programming
Python
Tracing
Scripting
CLI
This is just a short script implementing a logger of the trace of a Python program’s execution.
Jan 31, 2024
Galen Seilis
 

The Memoryless Gap

Mathematics
Mathematical-Statistics
This post is just some spitballing around the idea of quantifying the memory of a distribution.
Jan 28, 2024
Galen Seilis
 

When do the bounds on a Poisson’s median almost equal the mean?

Mathematics
Mathematical-Statistics
When do the bounds on the median \(\nu\) of a Poisson distribution equal (or nearly equal) the mean of the distribution, \(\frac{1}{\lambda}\)?
Jan 28, 2024
Galen Seilis
 

A Rust Implementation of a Simple Clock DES

Simulation
Discrete-Event-Simulation
Rust
Here is a Rust implementation of a simple event-based discrete event simulation.
Jan 26, 2024
Galen Seilis
 

A Ciw Implementation of SimPy’s Car Example With a Process Interaction

Simulation
Discrete-Event-Simulation
Python
Ciw
This post is a continuation of A Ciw Implementation of SimPy’s Car Example, and may be considered a prerequisite for reading this post.
Dec 20, 2023
Galen Seilis
 

Implementing a G/M/1 Queue in Ciw

Simulation
Discrete-Event-Simulation
Queueing-Networks
Ciw
Ciw is a Python package for simulating queueing networks.
Dec 20, 2023
Galen Seilis
 

Implementing a Kelly Network in Ciw

Simulation
Discrete-Event-Simulation
Queueing-Networks
Ciw
Ciw is a Python package for simulating queueing networks.
Dec 20, 2023
Galen Seilis
 

List of Example Implementations of Some Classic Queue Models in Ciw

Simulation
Discrete-Event-Simulation
Queueing-Networks
Ciw
Here is a list of implementations of classic classes of queueing models (Kendall 1953).
Dec 20, 2023
Galen Seilis
 

Implementing a M/D/1 Queue in Ciw

Simulation
Discrete-Event-Simulation
Queueing-Networks
Ciw
Ciw is a Python package for simulating queueing networks. An M/D/1 queue can be implemented and simulated using Ciw in the following way.
Dec 20, 2023
Galen Seilis
 

Implementing a M/D/c Queue in Ciw

Simulation
Discrete-Event-Simulation
Queueing-Networks
Ciw
Ciw is a Python package for simulating queueing networks. A M/D/c queue can be implemented and simulated using Ciw in the following way.
Dec 20, 2023
Galen Seilis
 

Implementing a M/M/infinity Queue in Ciw

Simulation
Discrete-Event-Simulation
Queueing-Networks
Ciw
Ciw is a Python package for simulating queueing networks. A M/M/\(\infty\) queue can be implemented and simulated using Ciw in the following way.
Dec 20, 2023
Galen Seilis
 

Implementing a M/G/1 Queue in Ciw

Simulation
Discrete-Event-Simulation
Queueing-Networks
Ciw
Ciw is a Python package for simulating queueing networks.
Dec 20, 2023
Galen Seilis
 

Implementing a M/G/k Queue in Ciw

Simulation
Discrete-Event-Simulation
Queueing-Networks
Ciw
Ciw is a Python package for simulating queueing networks.
Dec 20, 2023
Galen Seilis
 

Implementing a M/M/1 Queue in Ciw

Simulation
Discrete-Event-Simulation
Queueing-Networks
Ciw
Ciw is a Python package for simulating queueing networks. An M/M/1 queue can be implemented and simulated using Ciw in the following way.
Dec 20, 2023
Galen Seilis
 

Implementing a M/M/c Queue in Ciw

Simulation
Discrete-Event-Simulation
Queueing-Networks
Ciw
Ciw is a Python package for simulating queueing networks. A M/M/c queue can be implemented and simulated using Ciw (Kendall 1953) in the following way.
Dec 20, 2023
Galen Seilis
 

An Overview of Ciw

Simulation
Discrete-Event-Simulation
Queueing-Networks
Ciw
Ciw is a three-phase approach discrete-event simulation framework specialized in simulating queueing networks.1{:target=“_blank”} It enables configuration and customization…
Dec 20, 2023
Galen Seilis

Implementing a D/M/1 Queue in Ciw

Python
Discrete Event Simulation
Ciw
Queueing Network
Queueing System
Queueing Theory
Exponential Distribution
Statistics
Operations Research
Random Variables
Inter-Arrival Times
Service Times
Random Number Generation
Servers
Ciw is a Python package for simulating queueing networks.
Dec 20, 2023
Galen Seilis

Implementing a G/G/1 Queue in Ciw

Python
Discrete Event Simulation
Ciw
Simulation
Queueing Systems
Queueing Theory
Hyperexponential Distribution
Gamma Distribution
Statistics
Operations Research
Random Variables
Inter-Arrival Times
Service Times
Ciw is a Python package for simulating queueing networks.
Dec 20, 2023
Galen Seilis
 

A Ciw Implementation of SimPy’s Car Example

Python
Simulation
Queueing System
Queueing Network
Queueing Theory
Routing
Process-Based Simulation
Random Variables
Constant Random Variables
Arrival Distributions
Service Distributions
Timing
Initialization
Discrete Event Simulation
Ciw
SimPy
In the SimPy documentation they describe a car process which involves a car which transitions between parking and driving. From being parked it takes 5 units of time to…
Dec 20, 2023
Galen Seilis

A Rust Implementation of SimPy’s Simple Car DES

Rust
Discrete Event Simulation
Python
SimPy
Simulation
Software Design
Prototyping
CPython
PyPy
This post gives an implementation of this example from the SimPy documentation:
Dec 20, 2023
Galen Seilis
 

A Ciw Implementation of SimPy’s Clock Example

Python
Discrete Event Simulation
Ciw
SimPy
This post looks at implementing a simple simulation described in the SimPy documentation using the Ciw Python package (Palmer et al. 2019).
Dec 19, 2023
Galen Seilis
 

Basic Example of Using Sockets to Communicate and Process Data in Python

Programming-And-Development
Programming-Languages
Python
Python-Networking
Socket-Communication
Data-Serialization
Mermaid-Diagrams
In the world of network programming, establishing communication between different scripts or applications is a common necessity. One powerful method to achieve this is…
Dec 17, 2023
Galen Seilis
 

What would happen if the infinity stones were in contact with two characters with opposite goals?

Movies
Marvel-Cinematic-Universe
Avengers-Infinity-War
I asked this question on a Stack Exchange site, but I deleted it since it was poorly received. I think it is a fun, if not frivolous, question. Feel free to leave comments…
Dec 14, 2023
Galen Seilis
 

Developing Everything Tools

Software
Software-Frameworks
I have been thinking about software development architecture and reading from Architecture Patterns with Python and thinking about what goes wrong with programming larger…
Dec 10, 2023
Galen Seilis
 

A Discrete Event Simulation Generalization of Snakes and Ladders Using Ciw

Simulation
Discrete-Event-Simulation
Ciw can be used to bring discrete event simulation to games. In this post I considered a Ciw-ified version of Snakes and Ladders. There are aspects that we can faithfully…
Nov 25, 2023
Galen Seilis
 

Five Years Long And The Love Is Gone (Guitar)

Song-Writing
I asked ChatGPT to write guitar chords for the song it developed for me. I have yet to hear what this actually would sound like. Maybe at some point I’ll get some software…
Nov 24, 2023
Galen Seilis
 

Five Years Long And The Love Is Gone

Song-Writing
(Verse 1) On a summer’s eve, on my birthday night, I met a love that shimmered so bright. Her smile was a beacon in the dark, But little did I know, she’d leave her mark.
Nov 23, 2023
Galen Seilis
 

A Permutative Generalization of the Cross Product Is Just the Cross Product

Mathematics
Linear-Algebra
Cross-Product
The goal of this post is to present a minimal description of a generalization of the cross product between two vectors.
Nov 12, 2023
Galen Seilis
 

WTF Moment Reading Chapter 2 of Learning Python by Mark Lutz

Computer-Programming
Python-Programming
I have moments that I find amusing and frustrating when reading technical books. This post briefly shares one.
Nov 9, 2023
Galen Seilis
 

Applications of Samuelson’s Inequality

Statistics
Mathematical-Statistics
Samuelson-Inequality
Samuelson’s inequality allows us to put bounds on the values in a collection of data points that we do not have (Samuelson 1968).
Nov 3, 2023
Galen Seilis
 

Parallel Execution of a DAG on Functions in Topological Order

Programming
Concurrent-Programming
My goal in this post is just to show a little trick to computing a collection of functions in a way that satisfies some partial order.
Nov 2, 2023
Galen Seilis
 

Vector function checklist

Mathematics
Vector-Functions
Suppose you have a function \(f : \mathbb{R}^n \mapsto \mathbb{R}^m\) and you want to learn about its properties. In this post I’ve enumerated a checklist of things you can…
Oct 31, 2023
Galen Seilis
 

Summarize columns in a table using Microsoft SQL Server

Database-Programming
SQL
Tsql
I realized that it would be handy to have a SQL script for quickly pulling up basic information on the columns of a table in Microsoft SQL server. This is a first…
Oct 30, 2023
Galen Seilis
 

Agnesian Flatness

Mathematics
Calculus
Agnesian-Operator
Agnesian-Flatness
Inspired by spectral flatness as an application of the inequality between the geometric mean and arithmetic mean, I decided to define something analogous in terms of the…
Oct 26, 2023
Galen Seilis

Parity Decomposition Plots of Scalar Functions in Python

Mathematics
Parity
Function-Parity-Decomposition
Every function is even, odd, or neither. And by “neither” I also mean a bit of both. There is a decomposition theorem which states that every function equipped with addition…
Oct 26, 2023
Galen Seilis
 

External Schedule of Ciw Simulations

Discrete-Event-Simulation
Queueing-Networks
Ciw
It would be desirable to make arbitrary changes to the state of a simulation according to a schedule. This is useful for simulating emergencies and disasters where the…
Oct 25, 2023
Galen Seilis
 

Can Ciw Queues be Initialized With Individuals?

Discrete-Event-Simulation
Queueing-Networks
Ciw
Although this issue has been considered in the past, Ciw does not have an officially supported way to begin a waitlist (i.e. queue) with a collection of individuals. For…
Oct 24, 2023
Galen Seilis
 

Divergence of the Neutrosophic Differential Operator

Math
Neutrosophic-Numbers
In a recent post I introduced the following differential operator:
Oct 24, 2023
Galen Seilis
 

Moose Scat Orientation Analysis

Statistics
Circular-Statistics
I’ve had this idea in the back of my mind for a while. It would be an interesting problem if data were available.
Oct 24, 2023
Galen Seilis
 

How to list all available databases paired to their tables and attributes in Microsoft SQL Server

SQL
Microsoft-SQL
SQL-Server
While this isn’t a solution I intend on going with for my use cases, I thought I would note that a bird’s-eye-view of all databases paired to their respective tables in turn…
Oct 24, 2023
Galen Seilis
 

Arithmetic of Complex Numbers as Vector Functions

Math
Complex-Numbers
The basic arithmetic operations on complex numbers can be represented as vector functions.
Oct 23, 2023
Galen Seilis
 

Arithmetic of Neutrosophic Numbers as Vector Functions

Math
Neutrosophic-Numbers
In this post I map the arithmetic of neutrosophic numbers (Kandasamy and Smarandache 2004) to vector functions and then aimlessly wander.
Oct 23, 2023
Galen Seilis
 

Can Ciw Use Tuples For Class IDs?

Discrete-Event-Simulation
Queueing-Networks
Ciw
It would be convenient to keep track of classes of customers in Ciw networks based on a collection of attributes. A first approximation is to try using tuples since they are…
Oct 23, 2023
Galen Seilis
 

Ciw Hack to Get Resampling Routing Matrices

Discrete-Event-Simulation
Queueing-Networks
Ciw
The Ciw library allows for a stochastic matrix representing probabilities of transitioning from one service to another. Here is an example from the documentation.
Oct 22, 2023
Galen Seilis
 

Notes On Beautiful Python Refactoring Video

Computer-Programming
Refactoring
This post is just some notes I took while watching the following video:
Oct 22, 2023
Galen Seilis
 

Machine Learning For Optography?

Machine-Learning
Optography
I watched this YouTube short by VSauce (Michael Stevens). It describes optography which is an obscure topic of obtaining images from the retinas of certain animals including…
Oct 21, 2023
Galen Seilis

Minimal Bayesian Von Mises Model Example

Statistics
Bayesian-Statistics
Von-Mise-Distribution
Found this code in my miscellaneous bin folder. Instead of deleting it I thought I would share it here. It is a minimal working example of using the PyMC package to model a V…
Oct 21, 2023
Galen Seilis
 

Response To Dustin Fife On Rank-Based Nonparametric Statistics

Statistics
Rank-Based-Statistics
This post is the home page to a collection of responses to the following video, which gives the relevant context.
Oct 21, 2023
Galen Seilis
 

ChatGPTs Attempt at Producing a Network Model From SQL Queries

Chatgpt
Programming
A problem I am interested in is extracting a network model on a collection of tables using a Python package (e.g. sqlparse or sqlglot) to produce a networkx multigraph.
Oct 20, 2023
Galen Seilis
 

The Empirical Cumulative Distribution Function Is Rank-Based

Statistics
Rank-Based-Statistics
Empirical-Cumulative-Distribution-Function
There is a relationship between rank-based statistics and the notion of an empirical distribution function. The empirical cumulative distribution function can be written as
Sep 9, 2023
Galen Seilis

Rank-Based Structural Equation Modelling

Statistics
Rank-Based-Statistics
Rank-Based-Sem
When I listen to what people are describing as patterns in the data I rarely find that linearity itself is of any core interest. Rather, many tools and educational resources…
Sep 9, 2023
Galen Seilis
 

A Rank-Based Mixed Effects Model

Statistics
Rank-Based-Statistics
This post is a response to a particular claim made in the following video:
Sep 6, 2023
Galen Seilis
 

The Ultimate Goal Of Research Is Not Parametric Models

Statistics
Nonparametric-Statistics
This post is part of a series of posts responding to the following video.
Sep 5, 2023
Galen Seilis
 

Bayesian Rank-1 Non-Negative Canonical Polyadic Decomposition In PyMC

Statistics
Bayesian-Statistics
Bayesian-Canonical-Polyadic-Decomposition
Bayesian-Non-Negative-Canonical-Polyadic-Decomposition
This post is just a quick example of how to perform Bayesian non-negative canonical polyadic decomposition in PyMC. Here we will only perform a rank 1 decomposition with…
Aug 29, 2023
Galen Seilis
 

Hacking The Data To Meet The Assumptions

Statistics
Rank-Based-Statistics
This post is an ongoing series of posts that respond to the following video:
Aug 26, 2023
Galen Seilis
 

Are Rank-Based Statistics Bad For Incentives?

Sociology
Incentives
This post is part of a collection of posts responding to various aspects of the following video:
Aug 26, 2023
Galen Seilis

Spearman Correlation Quantifies Comonotonicity

Statistics
Rank-Based-Statistics
Spearman-Correlation
This post is part of a collection of posts responding to various aspects of the following video:
Aug 26, 2023
Galen Seilis
 

Beyond Studying Order With Ranks

Statistics
Rank-Based-Statistics
This post is an ongoing series of responses to the following video:
Aug 26, 2023
Galen Seilis
 

What Is A Useful Statistic?

Statistics
Useful-Statistics
This post is part of series of posts responding to the following video.
Aug 26, 2023
Galen Seilis
 

Opinion - Tableau Should Fully Support Common SQL Dialects

Tableau
Custom-SQL
Common-Table-Expressions
I recently noticed that Tableau does not support common table expressions in “Custom SQL” data sources when I was trying to set up a new data source for a dashboard. It is…
Aug 21, 2023
Galen Seilis
 

RE Is this a controversial opinion about statistics?

Statistics
This post is a response to the following video:
Aug 21, 2023
Galen Seilis
 

Nonparametric Statistics Don’t Model The Mathematical Structure Of Nature?

This post is part of a collection of posts responding to the following video.
Aug 20, 2023
Galen Seilis
 

Maybe Kedro Will Get A Badge!

Python
Kedro
So far I have enjoyed using Kedro to build data science workflows. If you are unfamiliar with Kedro you should check them out.
Aug 19, 2023
Galen Seilis
 

Rank-Based Statistics For Convergence Issues

Statistics
Rank-Based-Statistics
This post is a response to a particular claim made in the following video:
Aug 19, 2023
Galen Seilis
 

Insane Probability Density Functions From My MSc Thesis.

Mathematics
Mathematical-Statistics
I was just rummaging through some old files and folders when I found some bizarre attempts at deriving some sort of (I think) probability density functions. I don’t think…
Aug 18, 2023
Galen Seilis
 

Notes On BPMAG’s Process Modelling Lectures

Process-Modelling
I found this playlist on the Business Process Management & Analytics Group’s (BPMAG) YouTube channel. My initial interest in this set of lectures came from wanting to learn…
Aug 9, 2023
Galen Seilis
 

Just Plugging In Ranks

Mathematics
Statistics
Rank-Based-Statistics
This post is part of continued response to the following YouTube video:
Aug 7, 2023
Galen Seilis
 

Unlike Pluto Is Killing it!

Music
Unlike-Pluto
Lately I have been thoroughly enjoying a few songs that Unlike Pluto recently came out with.
Aug 7, 2023
Galen Seilis

Wilcoxon’s Heuristic

Mathematics
Statistics
Rank-Based-Statistics
This post was prompted by a statement given in the following video.
Aug 6, 2023
Galen Seilis

Plotting Hasse Diagrams With Networkx (A First Approximation)

Python
Plotting
Disappointed by ChatGPT in Asking ChatGPT to Code a Plotting Function for Covering Diagrams but inspired by some of the diagrams in The Joy of Abstraction: An Exploration of…
Jun 10, 2023
Galen Seilis
 

Jaimie Krems’ Tackling Friendship

Sociology
Friendship
I found this talk fascinating. I have not finished thinking about it. I have concerns about the statistical methods, but some of the theoretical concepts presented are…
Jun 3, 2023
Galen Seilis
 

Bob Ross ASMR Is A Thing

Asmr
Bob Ross was known for having a soft and relaxing voice. Purportedly listening to his shows can cause ASMR, where ASMR is reported to be a tingling sensation. Since his time…
May 28, 2023
Galen Seilis
 

From Criss-Crossed Toes To Gamma Skies

Music
Music-Appreciation
The last week or so I’ve been watching videos by The Hoof GP, like this one for example:
May 28, 2023
Galen Seilis
 

A Biology Guy Divided By Zero

Math
Algebra
Division
I want to share a recollection of an amusing argument I had back in my undergraduate days. A biology professor explained a definition of narrow sense heritability in the…
May 28, 2023
Galen Seilis
 

Feedback On The New Food Web Curriculum

Ecology
Heterotrophy
Food-Webs
I saw the following diagram and wanted to give some feedback.
May 28, 2023
Galen Seilis
 

MSc Convocation

Education
Convocation
I’m very please to report that I have had my convocation! I officially graduated in Fall 2022 with a MSc in Computer Science.
May 26, 2023
Galen Seilis
 

Differentiation With Respect To A Random Variable

Mathematics
Mathematical-Statistics
I posted this a while ago, but I thought I would put it here as well. It is for a lot of people an obscure mathematical distinction that taking the derivative with respect…
May 22, 2023
Galen Seilis

Painting 8

Art
Painting
Wet-On-Wet
I finished my 8th painting!
May 21, 2023
Galen Seilis
 

Quick Review of the Graphoid Axioms

Statistics
Mathematical-Statistics
Consider the following definition (Pearl 2009):
May 20, 2023
Galen Seilis
 

Dependence Entropy

Statistics
Mathematical-Statistics
I want to share an update in my thinking since asking and answering A formal definition of a “measure of association”{:target=“_blank”}. I’ve developed a functional which…
Apr 26, 2023
Galen Seilis
 

ChatGPT on Parametric Models as The Ultimate Goal of Research

Research
Statistics
The following video claims the following:
Apr 21, 2023
Galen Seilis
 

ChatGPT on FDA vs Stochastic Processes

Statistics
Functional data analysis is an approach to modelling that appears similar to stochastic processes. This is because stochastic processes deal with functions in the sense of…
Apr 21, 2023
Galen Seilis
 

ChatGPT On Canada’s Anesthetist Shortage

Chatgpt
I asked ChatGPT a question about hospitals adapting to Canada’s shortage in anesthetists. I’ve put the Q&A below.
Apr 10, 2023
Galen Seilis
 

ChatGPT on Duration for Oil Paint to Dry

Chatgpt
Art
Painting
Oil-Painting
Recently I have had some challenges with my oil paints, especially when using a palette knife. One of the possible solutions is to let my paint thicken by letting it air…
Apr 10, 2023
Galen Seilis
 

ChatGPT on “Ontological Infinity

Chatgpt
Philosophy
Ontology
Infinity
Ontological-Infinity
Prompted by a conversation with a philosophically-interested acquaintance, I asked ChatGPT a question about “ontological infinity”. I’ve put the Q&A below.
Apr 10, 2023
Galen Seilis
 

Dr. Lisle’s Lecture On The Mandelbrot Set

Math
This post is a reaction to the video The Mandelbrot Set: Atheists’ WORST Nightmare.
Apr 10, 2023
Galen Seilis
 

Notes On The Problem With Cultural Evolution

Cultural-Evolution
This post is about a fascinating talk by Richard McElreath. I’ve taken some notes below which focus on some of the general statistical and causal points which I think would…
Apr 3, 2023
Galen Seilis

A Sum Rule For Silviculture Surveys

Forestry
Mathematical-Forestry
This post is based on a memorandum I wrote on 2019-06-12.
Mar 24, 2023
Galen Seilis
 

A Functional Inspired by Min-Max Normalization

Math
Functions
Functionals
For a function \(F: \mathbb{R}^n \mapsto \mathbb{R}\) we can consider the functional
Mar 19, 2023
Galen Seilis
 

What Are Nonparametric Statistics?

Statistics
Nonparametric-Statistics
The distinction of “parametric” vs “nonparametric” statistics is worth making as it allows us to quickly categorize broad areas of techniques. It isn’t without problems…
Mar 10, 2023
Galen Seilis
 

Bandit On Bandit

Python
Security
Information Security
Bandit
Bandit is a Python package for checking for security issues in Python code. I have been thinking about using Bandit to check for security risks in my own software as well as…
Mar 9, 2023
Galen Seilis
 

Training Predictive Models Does Not Assume Statistical Dependence

Statistics
Statistical Independence
Predictive Modelling
Assumptions
Conditional Expectation
Python
NumPy
It was suggested to me recently that to fit a predictive model supposes that the domain variables cause the image variables. This is not the case.
Mar 6, 2023
Galen Seilis

Crayon 1

Art
Crayon
I tried googling “what is a picture made with crayon called” and I consistently got suggestions for crayon etching, which is a more specific usage of crayons. I asked…
Mar 5, 2023
Galen Seilis

How Expressive Are Simple Neural Networks?

Machine Learning
Neural Networks
It is well-known that neural networks are universal function approximators under mild assumptions (Cybenko 1989; Hornik et al. 1989). Such theorems proving arbitrary bounds…
Mar 5, 2023
Galen Seilis
 

Automorphism Orbits of Graphlets

Math
Graph Theory
Graphlets
Automorphisms
Automorphism Orbits
Automorphism Orbits of Graphlets
Isomorphisms
Graphs
Relations
Binary Relations
Sets
Vertices
Edges
Subsets
Cartesian Products
Networks
directed Graphs
Digraphs
Signed Graphs
Weighted Graphs
Simple Graphs
Functions
Injective Functions
Surjective Functions
Bijective Functions
Graph Isomorphism
Graph Automorphisms
Equivalence Relations
Reflexive Relations
Symmetric Relations
Transitive Relations
Equivalence Classes
Vertex Orbit Automorphisms
Permutation Groups
Back in May 2020 I released a video on YouTube for the HackSeq event:
Mar 3, 2023
Galen Seilis

Painting 7

Art
Painting
Wet-On-Wet Technique
Oil Painting
I finished my 7th painting!
Mar 3, 2023
Galen Seilis
 

Quotes From The Phaneron

Quotes
Nothing like an assortment of miscellaneous quotes, right? I don’t entirely agree with them, nor with everything else the people who said them have said, but these quotes…
Mar 3, 2023
Galen Seilis

Mixtures of Dirac Delta Distributions in PyMC

Statistics
Dirac Delta Distribution
Python
PyMC
Arviz
Matplotlib
NumPy
Mixture Distributions
Poisson Distribution
Dirichlet Distribution
Bayesian Inference
Bayesian Modelling
Bayesian Probability
Bayesian Statistics
This post just shows what a Dirac delta distribution is and how to make a mixture of Dirac delta distributions in PyMC.
Mar 1, 2023
Galen Seilis
 

What are Ranks?

Statistics
Ranks
Rank-Based Statistics
This post looks at the notion of ranking data or variables. Broadly, ranks are numbers used to describe something about the order-like properties on the elements of a set.…
Feb 26, 2023
Galen Seilis

Notes on Differential Forms

Mathematics
Differential Forms
Suppose \(C \subseteq \mathbb{R}^2\) is a curve and \(p \in C\). The tangent space to \(C\) at \(p\), \(T_pC\) is the set of all vectors tangent to \(C\) at \(p\) (Flanders…
Feb 25, 2023
Galen Seilis
 

Asking ChatGPT About Avoidable Admissions

Healthcare
Hospital
Avoidable-Admissions
I asked ChatGPT a bunch of questions about avoidable admissions. I’ve put the Q&A below.
Feb 23, 2023
Galen Seilis
 

Life After Love - By ChatGPT

Chatgpt
Song-Writing
I asked ChatGPT to write a song about life after love. This is what it came up with:
Feb 23, 2023
Galen Seilis
 

Asking ChatGPT About Order Theory

Math
Order-Theory
History
I asked ChatGPT a bunch of questions about order theory. Most of the questions are about history. I’ve put the Q&A below.
Feb 22, 2023
Galen Seilis

Asking ChatGPT to Code a Plotting Function for Covering Diagrams

Chatgpt
Coding
Python
Function
Plotting
I asked ChatGPT: > Write a Python script which takes a networkx.DiGraph object representing a partial order and plot it according to the rules of a covering diagram.
Feb 19, 2023
Galen Seilis

Notes on Order Theory

Mathematics
Order Theory
Partial Orders
Reflexive Relations
Transitive Relations
Antisymmetric Relations
Asymmetric Relations
Cartesian Products
Binary Relations
Relations
Python
LaTeX
Directed Acyclic Graphs
Strict Partial Orders
This section provides an overview of some fundamental concepts in order theory.
Feb 19, 2023
Galen Seilis
 

A Happy Little Tribute to Bob Ross - by ChatGPT

Art
Painting
Oil-Painting
Wet-On-Wet-Technique
Summer 2022 I tried painting for the first time since I was a child. It began with listening to Bob Ross on YouTube because it was relaxing background. Over time I drifted…
Feb 18, 2023
Galen Seilis
 

Test Post

Meta
Starting
\(\int_a^b f(t) dt\)
Feb 15, 2023
Galen Seilis
 

Why GLM is Inferior - by ChatGPT

Jekyll Update
This post is a tongue-in-cheek response to Professor writes a love song to statistics.
Feb 10, 2023
Galen Seilis
 

How to Plot a Basic Pie Chart Of Taxa At A Given Taxonomic Rank Using Pandas And Matplotlib

Python
Volunteer
iNaturalist
Data
Plotting
Matplotlib
Pandas
Citizen Science
This post was migrated from my iNaturalist journal to my Jekyll blog on 2023-02-26. It was then migrated to my Quarto blog on 2024-07-27.
Mar 16, 2022
Galen Seilis
 

Unzip Your iNaturalist Observations On A Ubuntu System

BASH
Volunteer
iNaturalist
Data
Citizen Science
Linux
Ubuntu
This post was migrated from my iNaturalist journal to my Jekyll blog on 2023-02-26. It was then migrated to my Quarto blog on 2024-07-27.
Mar 16, 2022
Galen Seilis
 

What is dyadic sampling in the context of a wavelet transform?

Math
Integral-Transforms
Wavelets
This question was automatically deleted from math.stackexchange.com.
Feb 1, 2022
Galen Seilis
 

Series expansion for total derivative of finite order?

Math
Calculus
Derivatives
Total-Derivatives
This question was automatically deleted from math.stackexchange.com.
Jan 27, 2022
Galen Seilis
 

How do I find the tensor rank decomposition of this 3-way tensor?

Math
Tensors
Tensor-Decomposition
This question was automatically deleted from math.stackexchange.com.
Dec 13, 2021
Galen Seilis
 

Is the Verhulst (logistic) growth function convex over its parameters?

Math
Functions
Convex-Functions
This question was automatically deleted from math.stackexchange.com.
Nov 2, 2021
Galen Seilis
 

Contrast a strong vs weak solution of a stochastic differential equation

Math
Differential-Equations
Stochastic-Differential-Equations
This question was automatically deleted from math.stackexchange.com.
Jul 24, 2021
Galen Seilis
 

How do I derive the distribution of a real-valued statistic from real-valued random variables with known univariate distributions?

Statistics
Probability-Distributions
This question was automatically deleted from math.stackexchange.com.
Jul 3, 2021
Galen Seilis
 

Does freeness generalize to finite rank tensors?

Math
Tensors
This question was automatically deleted from math.stackexchange.com.
Jun 22, 2021
Galen Seilis
 

Is there a pseudoinverse for tensors of finitary rank?

Math
Tensors
This question was automatically deleted from math.stackexchange.com.
Jun 22, 2021
Galen Seilis
 

Some Notes From High Performance Python

Python
CHAPTER 1 - numexpr improves numerical computation by compiling (https://numexpr.readthedocs.io/en/latest/intro.html)
Feb 13, 2021
Galen Seilis
 

QuantEcon 1 Numba

Python
Scipy
NumPy
timeit
optimization
Numba
Numba is a Python library that provides an open source just-in-time compiler that allows a coder to mark selected parts of their code to be compiled for faster execution. As…
Apr 9, 2019
Galen Seilis
 

QuantEcon 1 Scipy Submodules

Python
Scipy
NumPy
scipy.optimize
Newton Raphson method
Brents method
timeit
bisect method
optimization
As someone with previous background in Python, I’ve been blasting my way through the basics of the Quantecon curricula. One of the joys of self-directed learning is that…
Mar 28, 2019
Galen Seilis
 

Starting Data Science

Data Science
I’ve been thinking about Data Science lately, and I recently watched a YouTube video describing how to get started learning prerequisite knowledge for this field. While I am…
Mar 23, 2019
Galen Seilis
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