# MATLAB: When I use the command ‘pcolor’ on a large matrix I get a blank plot – does anyone know why

blank plotpcolor

When I use the command 'pcolor' on a large matrix I get a blank plot – does anyone know why?
I want to use 'pcolor' to plot a matrix of 6144 by 150 – if I just generate a matrix of this size using a random generator e.g.: X=rand(6144,150)
and then plot: pcolor(X)
I get a blank screen but pcolor works fine for e.g.: X=rand(25,10)
h = pcolor(X);set(h, 'EdgeColor', 'none')