open PROC, "| c:/gnuplot/bin/gnuplot.exe" || die "Could not start gnuplot: $!";
#above :the first character in the filename is a pipe symbol (|)
print PROC "set xlabel 'Time'; set ylabel 'Amplitude';";
print PROC "set o 'graph.png';";
print PROC "set t png;";
print PROC "plot '-' u 1:2 t 'data' w l\n";
for( $x = 0.0; $x <= 10.0; $x += 0.1 ) {
$y = exp(-$x/5)*sin( $x );
print PROC "$x $y\n";
}
print PROC "e\n";
close PROC;