why imagesc display the matrix in black and white?

during a calculation of a complex matrix inside exp function i recived the following resault as seen in the attached image below the values are the real part of the matrix in both figures and they both go between 0 to 1 why the figure on the right is in black and white?

Answer 1

[Image Analyst]

You have not applied a colormap to that image on the right. The one on the left has a colormap applied to it.

[Kobi]

colormap works great but why did it turn into gray?

[Image Analyst]

You did not show your code, so I don't know. By default imagesc() applies the jet (I believe) colormap. I find application of some arbitrary colormap that may not be appropriate annoying. I would guess that in your code you called colormap(gray);