problems using my custom color map

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Dan
Dan il 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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per isakson
per isakson il 20 Apr 2013
Is
set(gcf,'Colormap',mycmap)
executed in the base workspace?
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Walter Roberson
Walter Roberson il 22 Apr 2013
set(gcf, 'Colormap', evalin('base', 'mycmap'))
Are you familiar with the concept of MATLAB "workspaces" ?
Dan
Dan il 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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Image Analyst
Image Analyst il 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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