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Unfortunately, I managed to delete my WordPress database at a time when the most recent backup I had was from 11 years ago. So… I will hopefully get some newer information uploaded again someti...

http://nklein.com/2024/09/i-broke-it/

In previous posts here, I described using Clifford algebras for representing points and rotations. I was never very satisfied with this because the translations were still tacked on rather than i...

http://nklein.com/2013/09/lines-are-big-circles/

The Bowling Game Kata in Functional Common Lisp from Patrick Stein on Vimeo. Code Kata are repetitive coding tasks designed to help one internalize certain patterns, methodologies, or tools. In t...

http://nklein.com/2013/08/the-bowling-game-kata-in-functional-common-lisp/

For some time, I’ve been wanting to find some big data source to dig around in and make plots of. Yesterday, I realized that I have access to #lisp logs from IRC going back several years. The f...

http://nklein.com/2013/07/irc-graphs/

Introduction SICP has a few sections devoted to using a general, damped fixed-point iteration to solve square roots and then nth-roots. The Functional Programming In Scala course that I did on Co...

http://nklein.com/inverse-functions-with-fixed-points

I updated my track-best library to allow you to keep all of the the things tied for best. The WITH-TRACK-BEST macro now accepts the :KEEP-TIES keyword parameter. Here are some examples of using t...

http://nklein.com/2013/07/track-best-library-updated/

In doing a problem set from the Internet a few weeks ago, I found myself writing awkward constructions with REDUCE and LOOP to try to find the best one (or two or three) things in a big bag of th...

http://nklein.com/2013/05/track-best-library-released/

One of the things that’s often said about Lisp is that it allows you to build up the language to you. Here are two examples that really drive home that point, for me. The Problem Domain I read ...

http://nklein.com/2013/05/building-the-language-up-to-you/

A friend of mine is taking a cryptography course this semester. One of his current homework problems involves creating , , and values for RSA Encryption. Always one to play the home game when mat...

http://nklein.com/two-snippets-I-rewrite-too-often

It’s been some time since I have posted here. Life has been busy. Until last week, I was working one and a half jobs after I transitioned out of getting paid to do C++ into getting paid to do C...

http://nklein.com/2013/03/tidbits-from-the-past-month-or-two/