Tag Archives: Lisp

Atabey Kaygun on Common Lisp Memoization

Posted on 2014-10-10 by jcs

Atabey Kaygun is a mathematician who likes to experiment with various (mostly mathematical) algorithms using Common Lisp. Many times, a function is most naturally implemented via recursion but this can lead to disastrously inefficient implementations. The canonical example is the … Continue reading →

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Common Lisp format Summary

Posted on 2014-10-08 by jcs

The Common Lisp format function is a bit controversial among some Lispers1. The problem is that the language used by format to specify output strings is un-Lisp like. I’m not one of those people. I like format and feel comfortable … Continue reading →

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October Quicklisp

Posted on 2014-10-07 by jcs

The October Quicklisp is available. Upgrade with the usual (ql:update-dist “quicklisp”)

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SBCL 1.2.4 Released

Posted on 2014-09-29 by jcs

Steel Bank Common Lisp 1.2.4 has been released and is available at the usual place. Check the NEWS page for what’s new in this release (mostly some improvements in how certain sequence functions are implemented). As usual, there were no … Continue reading →

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Wilfred Hughes on Macro Systems

Posted on 2014-09-28 by jcs

Wilfred Hughes has an interesting post, Comparitive Macrology, in which he looks at the macro systems of various languages. For each, he implements two macros: A swap macro to exercise hygiene An anaphoric macro to exercise (intentional) variable capture He … Continue reading →

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The Java Virtual Machine Tax

Posted on 2014-09-25 by jcs

Via Wilfred Hughes Much-needed straight talk about the "JVM tax" in Clojure and Scala, among other new language issues. RT @AidyLewis https://t.co/OpS1kuafTa — Alex Chamberlain (@dodgethestmrlr) September 23, 2014 I’ve often been tempted by Clojure but the JVM tax that … Continue reading →

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A Math & Lisp Blog

Posted on 2014-09-20 by jcs

If, like me, you’re interested in Mathematics and Lisp and like doing math experiments on a computer, you should check out Atabey Kaygun’s Blog. Kaygun is a Mathematician at Bahçeşehir University in Istanbul. On his blog he considers various problems … Continue reading →

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A Quick Introduction to Generic Functions & CLOS

Posted on 2014-09-14 by jcs

Zach Beane points to a nice post by Nicolas Hafner on Generic Functions and CLOS. CLOS is often considered a hideously complicated system but the basics are easy to understand and use and most people will never need to explore … Continue reading →

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Shamir’s Secret Sharing Implementation

Posted on 2014-09-11 by jcs

Yesterday, I discussed Shamir’s secret sharing and how it works. The TL;DR was a method to give \(n\) people a secret number so that any \(k\) of the recipients \((k\lt n)\) can reveal the secret. The method works by defining … Continue reading →

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Shamir’s Secret Sharing

Posted on 2014-09-10 by jcs

References to Jeremy Kun’s The Mathematics of Secret Sharing keep popping up in my feed so it appears there’s some interest in it. The problem is to entrust shares in a secret to \(n\) people in such a way that … Continue reading →

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