Hi, Given that I have say a vector A: [0,1,2,3,4,5] How can I use imagesc on this to get a graphic that would resemble a gradient (if you know what i mean, so that 0 is black ... to 5 being white) in a rectangle? I've tried the simple call imagesc(A) in Octave which definitely works for matrices for me (eg. not m by 1 dimensional or 1 by m dimensional) but it is not working for this and gives me the error: line 0: Sample period must be positive. Try `flip` for changing direction Any clues? Thanks!