Eric Weeks - personal pages - software Software information Miscellaneous programs I have written that may be of use to others

weeks@physics.emory.edu

This page provides information on the software used to generate some of the pictures displayed on my web pages. If you were searching on phrases like "cellular automata", "diffusion limited aggregation", "tilings", "source code", or other phrases, the software below may be of interest to you, or perhaps the pictures I have made.

Source Code and Information

Picture software

• quasi ("quasi.c"): A quasi crystal/Penrose tiling program; makes PostScript output.

• cell ("cell3.c"): A program to do cellular automata.

• trigplot ("trigplot3.c"): A program that does trigonometric function contour plots; makes output suitable for "a2ps" or "a2ppm" (see below).

• grass ("grass.c"): A simplified (and much faster!) form of diffusion limited aggregation which makes grass/coral-like pictures.

• spiral ("spiral.c"): Makes interesting, simple, 3-D looking spiral pictures.

• mandel ("mandel.c"): World's simplest Mandelbrot Set program.

Utility software

• IDL routines for particle tracking -- software developed mainly by John Crocker and David Grier, although I also wrote some of the routines.

• psdraw ("dps.c"): A simple utility program that allows you to make color or B/W PostScript drawings from data.

• a2ppm ("a2ppm.c"): A utility program that allows you to make black & white PPM output (a standard picture format that does not use compression and thus was easy for me to write this program).

• a2ps ("a2ps.c"): This is not "a2ps", a popular program available over Internet. This is a utility program that allows you to make black & white PostScript output from a fairly simple input format; useful for things like cellular automata. This program is useful if you want to make pictures but don't want to fuss with windows programming, for example.

• autocor ("autocor.c") : Computes the autocorrelation function for a time series.

• minfo ("minfo5.c") : This program implements the mutual information algorithm proposed by Fraser & Swinney for finding the ideal delay coordinate to use when plotting a strange attractor.

• minmax ("minmax.c") : Program which finds local minima and maxima in 1-D data.

• palette ("palette2.c"): This program prints a color chart of RGB values, useful for PPM values and PostScript color values.

• poincare ("poin.c"): Lets you take Poincaré sections from time series data.

• rotate ("rotate.c") : Rotates data in 3D; can be used with psdraw.

If you have questions send me email; email address below.

Links:

• My home page
  
• The picture page -- pictures made using this software.
  
• Graphics Techniques page