#Piece-wise Function Plot
set terminal png size 600, 400
set output 'plot.png'
#f(x) = 5*x for x<-3 ; f(x) = -5*x for x>3; f(x)=x otherwise
f(x) =(x>3)? -5*x : (x<-3)? 5*x : x
pl f(x) w lp