> -----Original Message----- > From: maxima-bounces at math.utexas.edu > [mailto:maxima-bounces at math.utexas.edu] On Behalf Of Olumide > Sent: Tuesday, September 23, 2008 8:44 AM => Vec = [x,y, x^2*y^2]; > diff(Vec,x); --> Result: 0? try assigning via ":" Vec: [x,y,x^2*y^2];