Judo Salt Genius

Introduction to Modular Arithmetic, with examples in Clojure

Though modular arithmetic is rather obscure, we actually use it every day—primarily when we tell time. And if you’re a programmer, you have probably used the % operator before. However, there is much more to modular arithmetic, and the way it seems to turn normal math on its head is very fascinating.

in Math · Thu 30 May 2019

Number Theory in Clojure: AKS primality test

The AKS test is an award-winning algorithm for proving whether an integer is prime, though I realized too late that it is too slow to be of any practical use. Writing the code itself was useful, though.

in Math · Mon 08 April 2019

Number Theory in Clojure: The Fundamental Theorem of Arithmetic

The first post in a new series exploring number theory in Clojure, starting with a discussion of primality testing and prime factorization.

in Math · Sun 31 March 2019

djdw on the 0s and 1s

After my previous fail trying to use autograd with pandas, I decided to set simple linear regression aside and attempt training a neural network. Here, I’ve adapted the network in the Welch Labs tutorial to accommodate an arbitrary number of layers. (However, floating-point arithmetic doesn’t follow suit quite so easily!)

in Math, Programming · Tue 05 February 2019

Linear Regression, Part 1.9999: Autograd Fail

I got halfway through this post only to be thwarted by the limits of the autograd module. The issue I opened on their GitHub repo has so far fallen on deaf ears, so I lost interest in linear regression for the time being.

in Statistics, Programming · Sat 02 February 2019