gnuplot> set xrange [0:10]gnuplot> set xlabel "time (s)"gnuplot> plot sin(x*pi) , sin(x*pi/2) , 0 , (sin(x*pi) > 0) - 0.5
gnuplot> plot sin(x*pi)*(sin(x*pi*10)) , sin(x*pi*10) , sin(x*pi)