Copyright (C) 2000 Oliver Knill

PPMMORPH
===========

ppmmorph is a filter to distort a given .ppm file with a 
two-dimensional toral maps called Standard maps. 

Currently installed is the Chirikov-Standard-map 
 
      '     `              '                 `
      |  x  |              | 2x -y + g sin(x) |
      |     |    ->        |                  |
      |  y  |              |      x           |
      `     '              `                  '

The INSTALL file contains installation information. 
Typing 
        make
and then 
        make test
should work. To install permanently in /usr/local/bin, run also 
        sudo make install
ppmmorph is free software. Consult the file COPYING for details. 
 
ppmmorph is invoked on the command line. Currently implemented is
the Chirikov Standard map T: (x,y) -> (2x-y + c sin(x),x)

The program was kept as simple as possible. Being less then 100 lines,
it can serve so well as a template for your own filters and be used 
together with the  netppm programs.  

Oliver Knill (oliver@dynamical-systems.org)   

2018 release: knill@math.harvard.edu: changes: 
gcc with flag  -Wno-unused-result,   Harvard Shield test file