problems using my custom color map

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Dan
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.

Accepted Answer

per isakson
per isakson on 20 Apr 2013
Is
set(gcf,'Colormap',mycmap)
executed in the base workspace?
  5 Comments
Walter Roberson
Walter Roberson on 22 Apr 2013
set(gcf, 'Colormap', evalin('base', 'mycmap'))
Are you familiar with the concept of MATLAB "workspaces" ?
Dan
Dan on 23 Apr 2013
Yes, but I just read up on the documentation to clarify things. I guess need to define the colormap inside of the function, or use your option Walter. Thanks for the help and advice!

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More Answers (1)

Image Analyst
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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