nothing show up when plotting with pcolor in 2D

I want to plot with "pcolor" in matlab, my X is [1*3529], Y is [1*2540], my Z is [2540*3529],

when I write the command pcolor(X,Y,Z) nothing show up, Why should it be like that?

Thanks,

Answer 1

[Kelly Kearney]

The syntax is fine, so it should work. Possibly OpenGL issues? Try:

figure;
pcolor(X,Y,Z);
set(gcf, 'renderer', 'zbuffer');

[Ali]

thanks for your answer, now when i type what you told me, figure opens but everywhere is black, why should it be like that?!

[Kelly Kearney]

The default with pcolor is faceted shading, i.e. the edges of the cells are shown in black. For a plot as dense as yours, all you'll see is this black.

Add

shading flat

after the plot to see the data values.

[Ali]

Thank you, it worked, one more thing is that, when I use the "xlim" command, it doesn't work, I am wondering if the command should be used differently or what?

[Kelly Kearney]

Hard to tell what "differently" would be, since you haven't showed how you tried it in the first place...

[Ali]

Hi,

I plotted with "pcolor" and it is fine, but I want it look like a contour, I am wondering how should I do? I tried contour(X,Y,Z) for the same vectors that I use in "pcolor" but it shows something wrong.

[Kelly Kearney]

Once again, "something wrong" is a difficult problem to solve without any details as to your data or calling syntax or what you see or how it differs from what you want.

[Image Analyst]

Why not just use

image(Z);

???