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I have been learning a little about CAPI, the GUI library that comes with LispWorks. I particularly wanted to find out how to draw graphics primitives inside a window, as I wanted to modify Paul Graham's toy ray-tracer to display images on screen. CAPI offers essentially the same 2D graphics programming model as the Java toolkits ...

Football off-seasons in the modern day are mercifully brief, for us supporters at least. Liverpool's pre-season is well underway and there have already been some transfers into and out of the club. But to draw a line under the past season, I thought I'd come up with a team of opponents whose strong performances against us ...

It's been years since I last wrote a keystroke driven Colorforth program, so I was trawling through the documentation and old code hoping it would jog my memory. It turns out that one word, pad (guessing it's short for 'keypad'), is all that it takes. Under normal circumstances, that is, when the CF system is in ...

I started reading comp.lang.lisp daily around 1997, and Naggum's articles were the main reason. He wrote so, er, persuasively on Lisp and related subjects. I hoped that he would pull through his prolonged illness, but it was not to be.

In my drive to optimize the performance of the Street Numbers problem solver, I had not taken the time to look at how others had attacked the problem. This was somewhat deliberate on my part, as I didn't want to 'peek at the answer' before having given it my best shot. But recently I came across ...