How do I plot the intensity profiles along the axis of a graph(x,z axis for example)

How do I plot the intensity profiles along the axis through the centre of image?

I've tried

x = [0:512];
z = [0:512];
figure;improfile(i,x,z),grid on;

[José-Luis]

Have you tried reading the documentation.

"It doesn't work" is not a helpful description of your problem.