Plotting a surface.

mundook{160}% gnuplot
     
        G N U P L O T
        unix version 3.5
        patchlevel 3.50.1.17, 27 Aug 93
        last modified Fri Aug 27 
05:21:33 GMT 1993
     
        Copyright(C) 1986 - 1993   
Thomas Williams, Colin Kelley
     
        Send comments and requests for 
help to info-gnuplot@dartmouth.edu 
        Send bugs, suggestions and mods 
to bug-gnuplot@dartmouth.edu
     
Terminal type set to 'x11'
     
gnuplot> set term pbm color
Terminal type set to 'pbm'
Options are 'small color'
     
gnuplot> set output "test2.ppm"
     
gnuplot> set hidden3d
     
gnuplot> splot [-3:3] [-3:3]  
exp(-.5*(x**2+y**2))/(2*pi)
     
gnuplot> quit
     
     
mundook{161}% ppmtogif test2.
ppm > test2.gif 
ppmtogif: computing colormap...
ppmtogif: 4 colors found