> load("draw"); > draw2d( explicit( signum(x^3), x,-4,4, y,-2,+2) ) > Hello, The correct syntax is draw2d( explicit( signum(x^3), x,-4,4), yrange=[-2,2]); The explicit object needs only the x-domain. As Wolfgang mentioned, write ? explicit; for more info. Happy new year. -- Mario Rodriguez Riotorto www.biomates.net