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Articles by Sam Ritchie
Power Series, Power Serious
This post spawned from work I've been doing on the SICMUtils library; I've just released 0.13.0 and I hope you'll give it a try. SICMUtils is the engine behind the wonderful "Structure and Interpretation of Classical Mechanics", an advanced physics textbook by Gerald Sussman of SICP fame. I'm trying to get the textbook running in the browser as a Clojurescript library, and as part of that effort I've had to re-implement quite a bit of numerical code in Clojure.
Functional Numerical Methods
This page contains a literate-programming exported version a definite-integral package I built into SICMUtils, a Clojure(script) based computer algebra system based on Gerald Sussman's scmutils. (Beware the buzzwords...) I expect that this post will fission into a full series, with a bit of explanation about how each piece fits into the whole.
Spring Clips and Stage Time
I'm out here working on the plane today - I haven't made it out much, lately, but I'm in the garage spending the time. This project will end up taking roughly five years, three years longer than I thought it might when I started. I've gone through so many oscillations of excitement and frustration out here. Some days I feel like I'm flying through tasks, and I think about how close I am to the end.
Book: The Second Mountain
I had a hard time with this book; it showed up in the TED book club mailing months ago, and I went into my reading primed to love the message, which is concise and persuasive... but maybe so persuasive on its own that the book feels like 300 pages of filler.
How to Publish CLJSJS Jars to Clojars
I've been doing a lot of work in Clojurescript lately, and the time finally came to pull in my first vanilla Javascript dependency. The default way to do this seems to be the CLJSJS project. CLJSJS publishes many Javascript packages in a form that you can consume from a Clojure project. For projects like React, you'll find the latest versions of the JS libraries, packaged up and ready to go.
Windshield and Windows Attached
The RV10 has windows! And a windshield! I've got everything attached and mostly cleaned up. Here's what it looks like now: I used three tubes of Lord 7545 A/E adhesive from Aerosport Products, one for each pair of side windows and a full tube for the windshield. The process was stressful; I've been mildly dreading this for a couple of years now. Compared to much of the metal work, this step is one-shot with permanent results.
Book: On Having No Head
What a strange, fantastic little book! I recently read Douglas Harding's "On Having No Head" after hearing Sam Harris mention the book in one of "Waking Up" meditations, and then many times on subsequent podcasts. The book is a long look at an insight that blew Harding's mind — from the first-person person, as a matter of subjective experience, there was no evidence around that he had a head.
Basis Changes for Linear Transformations
A 1-act sketch via Apple Pencil, for your viewing pleasure. Happy to link to further references or sketch this out in more detail — let me know in the comments if this is illuminating. Check it out below, or click here for a direct image link to stare at a big version in the browser.
Niwot's Challenge 2019 Race Report
Well, I can honestly say, now, close to a year after the event, that I don't remember this event in the furious detail that characterizes my usual race reports. How lucky! We're not supposed to talk about the Niwot's Challenge at all. I ran this race in 2019 for the second time, finishing in 27 hours and 17 minutes with Matt Fackrell and Jason Antin, my long-time collaborator on such beauties as "The Rainier Infinity Loop!" and the quite absurd "Tahoe 200, 2018 edition".
Dual Numbers and Automatic Differentiation
Dual Numbers and Automatic Differentiation Forward-Mode Automatic Differentiation Dual Numbers and AD Terminology Change! Binary Functions Multiple Variables, Nesting What Return Values are Allowed?
Entropy: Combinations and Permutations
In my ongoing quest to lay a more solid foundation for this new, strange life as a machine learning "researcher", I've been going through various foundational concepts and ideas and trying to build up rock solid intuitions that I can lean on for years. (Why the hell didn't I do this back in school??) Entropy is my latest obsession - thermodynamic entropy, and information entropy, and the ways in which these two things are similar.
Half Angles from Euler's Formula
I've been reading the lovely Visual Complex Analysis by Tristan Needham, and the visual-style proofs he's been throwing down have been wonderful and refreshing. I'll write more about this book and its goals later, but I was inspired this AM to write up a proof of the half angle identities from trigonometry using some of the tools from the book.
Optics and the Principle of Least Time
(This is a writeup of Exercise 1.3 from Sussman and Wisdom's "Structure and Interpretation of Classical Mechanics". See the solutions repository for more.) Law of Reflection Geometry Calculus Law of Refraction Calculus Geometry The problem explores some consequences for optics of the principle of least time.
Taylor Series and Imaginary Numbers
I wanted to share some of the intuition I've been developing around complex numbers; some of the resources that have been helpful, for understanding why anyone would come up with an idea like $i$, the square root of -1, and then build an entire number system on top of it.
Emory & Henry Men's Basketball Announces 2024-25 Team & Schedule
EMORY, Va. – With basketball practice officially underway, Emory & Henry University Head Men's Basketball Coach Jimmy Allen is excited to release information about the 2024-25 season. The Wasps' roster consists of 17 players with 10 returners, two transfers and five freshmen.
Sam Ritchie from Sam & The Womp (UK Number single) releases single from new solo project
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Guest Rob Shelsky UFO's & Time Travel 10/16/2019
radiation no joke and ufos in some cases been reported to give off lots of it Delete comment Block this user
Rainier Infinity Loop 2018 Attempt
Earlier this month I attempted to complete the biggest endurance adventure of my life: the Rainier Infinity Loop, a project dreamed up by the late Chad Kellogg. The line physically traces out a rather sloppy infinity sign by traveling over Mount Rainier, the most glaciated peak in the lower 48, 28 miles clockwise around its base on the Wonderland trail back to the start, over the mountain again and then counter-clockwise on the remaining 65 miles of the Wonderland trail.
Recruiting Versus Retention
Businesses are filling Oak Park's downtown real estate as quickly as space becomes available. This help-wanted sign for soon-to-open Altiro hangs in the window of the former Erik's Deli. Friends' stories of dropping off their children at college reminds me of our experience leaving our daughter at The Ohio State University a few years ago. With over ten thousand freshmen coming in each year, they have it down.
Leadville Trail 100, 2014 Edition
Leadville Trail 100, 2014 Edition Last weekend, I raced the Leadville Trail 100 for the second time. Last year's race was physically brutal; I sat curled up at the 50 mile point, 11 pounds light and unable to keep down fluids, for almost two hours before rallying and banging out a strong second half for a finish of 26:15 (strava report). That race earned me the silver belt buckle awarded to all finishers under 30 hours: Badass, right?
Leadville Trail 100
The Leadville Trail 100 This past weekend I ticked off one of my athletic life goals; the Leadville Trail 100, a brutal 100 mile running race in Colorado. I signed up for Leadville this May after a team injury forced our boat out of the 2013 Texas Water Safari, a 262 mile canoe race down in Texas that is my usual ultra-length torture for the year. Less than three months is less training than recommended for a hundred miler, but what the hell.
ICE Deports Non-Spanish Speaking American Citizen to Mexico
How does a U.S. citizen who has never been to Mexico, speaks no Spanish and shares no Mexican heritage end up being deported there, spending the next four months living on the streets and in the shelters and prisons of Mexico, Honduras, Nicaragua and Guatemala? It's just the latest instance of blatant disregard for the rights and well being of people with mental disabilities by Immigration and Customs Enforcement (ICE).
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