#Piecewise function plot
set terminal png size 400, 300
set output 'plot.png'
#f(x) = 5*x for -3<x<3 ; f(x) = -5*x  otherwise
f(x) =(x>=2)? x**2 :(x>=-1 && x<2)? x: -1 
pl f(x) w l lw 2