problems using my custom color map

Dan
2013 4 20
2 个回答
回答已采纳
5 次查看（30 天）

0 个投票

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.

请先登录，再回答此问题。

 采纳的回答

per isakson
per isakson 2013-4-20

0 个投票

Is
set(gcf,'Colormap',mycmap)
executed in the base workspace?

5 个评论
显示 3更早的评论 隐藏 3更早的评论

Dan
Dan 2013-4-20
It is executed inside of a plotting function I created.
per isakson
per isakson 2013-4-20
编辑：per isakson 2013-4-20
Then you have two alternatives (at least)
  1. pass mycmap into the plotting function as an input argument
  2. run the function
colormap( mycmap );
or
set(gcf,'Colormap',mycmap)
in the base workspace
Dan
Dan 2013-4-22
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
Walter Roberson 2013-4-22
set(gcf, 'Colormap', evalin('base', 'mycmap'))
Are you familiar with the concept of MATLAB "workspaces" ?
Dan
Dan 2013-4-23
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!

请先登录，再进行评论。

更多回答（1 个）

Image Analyst
Image Analyst 2013-4-20

0 个投票

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.

类别

在 帮助中心 和 File Exchange 中查找有关 Color and Styling 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by