Pyxplot

Download this example: script.ppl output.eps output.png

Using Pyxplot's numerical integration function

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Script

set samples 80
set key bottom right
set xformat r"%s$\pi$"%(x/pi)
set yformat r"%s$\pi$"%(y/pi)
set xrange [-5*pi:5*pi]
set width 7
set key below
plot int_dz(sinc(z),0,x)