豆粑粑 matlab colormap cold

meatball1982

Normally,  i perfer the "hot" colormap to illustrate the "heavy" -> "light" color.But with diff propeties of  the total opposite value, Such as ,the pops and popc denisty.
I need a color map as the opposite of "hot". Ha, I use the name "cold".
Great minds think alike.
I got the "cold " colormap on File Exchange.
https://cn.mathworks.com/matlabc ... 23865-cold-colormap

The same thought as I got.

1. function cmap = cold(m)
   
2. %COLD    Black-Blue-Cyan-White Color Map
   
3. %   COLD(M) returns an M-by-3 matrix containing a "cold" colormap
   
4. %   COLD, by itself, is the same length as the current figure's
   
5. %   colormap. If no figure exists, MATLAB creates one.
   
6. %
   
7. %   Example:
   
8. %       imagesc(peaks(500))
   
9. %       colormap(cold); colorbar
   
10. %
    
11. %   Example:
    
12. %       load topo
    
13. %       imagesc(0:360,-90:90,topo), axis xy
    
14. %       colormap(cold); colorbar
    
15. %
    
16. % See also: hot, cool, jet, hsv, gray, copper, bone, vivid
    
17. %
    
18. % Author: Joseph Kirk
    
19. % Email: jdkirk630@gmail.com
    
20. % Release: 1.0
    
21. % Date: 04/21/09
    
22. 
    
23. if nargin < 1
    
24.     m = size(get(gcf,'colormap'),1);
    
25. end
    
26. n = fix(3/8*m);
    
27. 
    
28. r = [zeros(2*n,1); (1:m-2*n)'/(m-2*n)];
    
29. g = [zeros(n,1); (1:n)'/n; ones(m-2*n,1)];
    
30. b = [(1:n)'/n; ones(m-n,1)];
    
31. 
    
32. cmap = [r g b];

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