set pm3d set xrange [-30:30] set yrange [-30:30] set isosamples 100,100 unset key unset border unset xtics unset ytics unset ztics set hidden3d set terminal pbm color medium set output "graph00.ppm"; splot f(x,y,0) set output "graph01.ppm"; splot f(x,y,1) set output "graph02.ppm"; splot f(x,y,2) set output "graph03.ppm"; splot f(x,y,3) set output "graph04.ppm"; splot f(x,y,4) set output "graph05.ppm"; splot f(x,y,5) set output "graph06.ppm"; splot f(x,y,6) set output "graph07.ppm"; splot f(x,y,7) set output "graph08.ppm"; splot f(x,y,8) set output "graph09.ppm"; splot f(x,y,9) set output "graph10.ppm"; splot f(x,y,10) set output "graph11.ppm"; splot f(x,y,11) set output "graph12.ppm"; splot f(x,y,12) set output "graph13.ppm"; splot f(x,y,13) set output "graph14.ppm"; splot f(x,y,14) set output "graph15.ppm"; splot f(x,y,15) set output "graph16.ppm"; splot f(x,y,16) set output "graph17.ppm"; splot f(x,y,17) set output "graph18.ppm"; splot f(x,y,18) set output "graph19.ppm"; splot f(x,y,19) set output "graph20.ppm"; splot f(x,y,20) set output "graph21.ppm"; splot f(x,y,21) set output "graph22.ppm"; splot f(x,y,22) set output "graph23.ppm"; splot f(x,y,23) set output "graph24.ppm"; splot f(x,y,24) set output "graph25.ppm"; splot f(x,y,25) set output "graph26.ppm"; splot f(x,y,26) set output "graph27.ppm"; splot f(x,y,27) set output "graph28.ppm"; splot f(x,y,28) set output "graph29.ppm"; splot f(x,y,29)
unset terminal
unset output
set xtics -30,0.2,30
set ytics -30,0.2,30
67,51 509,356
f(x,y,t)=exp(-((x-15)*(x-15)+(y-10)*(y-10))/500)*cos(2*sqrt((x-15)*(x-15)+(y-10)*(y-10))-2*pi*t/30)/5+exp(-((x+15)*(x+15)+(y-10)*(y-10))/500)*cos(2*sqrt((x+15)*(x+15)+(y-10)*(y-10))-2*pi*t/30)/5+exp(-((x-0)*(x-0)+(y+15)*(y+15))/500)*cos(2*sqrt((x-0)*(x-0)+(y+15)*(y+15))-2*pi*t/30)/5
