Could I change the color of specific point?

Hi, all

I have a matrix 49x49,

It's contains 0~10000 value.

When I plot this matrix, use colorbar.

But the zero value point,I want to use white color to present this point.

How can I do?

Thanks.

[Richard]

does it matter what all the other colors are? i.e. do you require them to be in color or will balck and white be ok? If balck and white are ok you could just alter the colormap of your plot to gray: http://www.mathworks.co.uk/help/matlab/ref/colormap.html

[BB]

Other color is use "colorbar" this command

only zero value use white

[Jan]

When you post the relevant part of your code, inserting modifications is much easier. Test data can usually created by RAND.

Answer 1

[Image Analyst]

Get the colormap, set 0 to white, then reapply it.

cm = colormap;
cm(0, :) = [255 255 255];
colormap(cm);

[BB]

when I evaluate

cm(0, :) = [255 255 255];

It's occur error

"Subscript indices must either be real positive integers or logicals."

[Image Analyst]

Sorry, I meant cm(1,:) - the first row which corresponds to gray level 0.

[BB]

Sorry= =

I key this code

cm = colormap;

cm(1, :) = [255 255 255];

colormap(cm);

It's still occurs error

"Colormap must have values in [0,1]."

:(

[Image Analyst]

That's right. The values must be in the range 0-1, not 0-255 even though it's really 255. So try this:

cm(1, :) = [1 1 1];

[BB]

ok,it's looks good. thank you~