To get started, simply type "octave" to start up the Octave program, and then type "runme" to run the runme.m script file. You must have this directory in your octave path (defined in your .octaverc file), or, alternatively, you can cd into this directory and then run octave from within this directory. If you have the misfortune of instead using Matlab, gunzip the comparagram (such as Jsum03.mat.gz) and change the one line of runme.m that receives input from Jsum03.txt to Jsum03.mat. Octave is more efficient in saving files (file space) so the porky Matlab files are kept gzipped. These files will load the variable Jsum03 which is the comparagram for skip 3 (in thirds of an f-stop, which is thus a full f-stop, so that k=2, and K=1). Jsum03.cls_fast.mat has the answer (result of running "runme.m") in case you want to see what it looks like when it's finished running. The entire script takes 35 to 40 seconds on a DELL OptiPlex GX200 with 512M RAM and 1GHz P3. (It should be faster on a fullsize desktop system.)