Plotting lower half of matrix

Question

susan 2011-10-28

Hi,

I have a matrix with values ONLY in the lower half (not even on diagonal). Everything else is zero.

I want to plot just this lower half using imagesc. Problem is there are values of zero in this lower half.

Is there a way around this? I tried tril

Thanks, S

Naz 2011-10-29

So, what's the problem with zeros? Imagesc should take pretty much all values.

Answer 1

Amith Kamath 2011-10-29

%I tried this:

X = rand(10,10); %My random pixel data for an image. imagesc(X); %Handles correctly.

L = tril(X); %To get the lower triangular part.

M = L.*(L > 0.5); % To introduce some artificial zeros into the lower triangular part.

imagesc(M); %This seems to display a good image too!

%Hope this helps!