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Asked by Dan
on 20 Apr 2013

Hi, I made a custom colormap (size = 15 x 3) and now I am trying to use it but it is not working. Here is the code:

...plotting code

set(gcf,'Colormap',mycmap)

And then I get this error:

Undefined function or variable 'mycmap'.

The mycmap variable is loaded into my workspace. Any help is appreciated.

Thanks, Dan.

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Answer by per isakson
on 20 Apr 2013

Accepted answer

Is

set(gcf,'Colormap',mycmap)

executed in the base workspace?

Show 2 older comments

Dan
on 22 Apr 2013

It works if I execute in the base workspace. Any ideas why it won't work inside of the function? Thanks for the help.

Walter Roberson
on 22 Apr 2013

set(gcf, 'Colormap', evalin('base', 'mycmap'))

Are you familiar with the concept of MATLAB "workspaces" ?

Answer by Image Analyst
on 20 Apr 2013

You can try using the colormap() function instead. Does this work for you?

grayImage = imread('cameraman.tif'); image(grayImage); mycmap = jet(15); % set(gcf,'Colormap',mycmap) colormap(mycmap); colorbar

Apparently you did not specify mycmap like you thought. Put this line right before your call to set():

whos mycmap

If it says it's undefined, then it is undefined, not 15 by 3 like you thought.

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