Can you please provide more details on what you are doing?

Thanks Dariusz to your interest, I have an image and i want to segment part of it which has max number of edges

After you segmented your image and made a new 2D array of the segmented piece, simply use 'imshow' to display it.

Is there command in matlab show area according number of edges on it?

no there isn't any command to do this automatically, but you can do it manually by either using the zoom function in the matlab figure or selecting a bounding box around the image region to display e.g. figure(4); image(uint8(I(a:b,c:d)+128); axis image; axis off; colormap(gray(256));title('edges'); i.e. the +128 is to view negative edges