How to set the unequal interval colorbar for colormap!
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ren ren
am 28 Mai 2019
Kommentiert: ren ren
am 28 Mai 2019
Hello, how to set the colorbar as the picture shows?
The colorbar is not the equal interval!
Thanks!
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Bjorn Gustavsson
am 28 Mai 2019
The QD-way I'd try first would be to make up a suitable transform of the data to map from being linear between 25 and 25 to what is desired. Something like this:
y = 1:19; % This defines the output of the data-transform
x = [-25:5:-5,-4:4,5:5:25]; % this is the input
d = 3*peaks(123);
dtr = d;
dtr(:) = interp1(x,y,d(:),'pchip'); % here we transform the data - only for displaying...
subplot(1,2,1)
imagesc(d)
colorbar
subplot(1,2,2)
imagesc(dtr)
cblh = colorbar; % and here we have to pay the price of being cunning/lazy
set(cblh,'ytick',1:19) % and set ticks and ticklabels manually
set(cblh,'ytick',1:19,'yticklabel',num2str(x'))
HTH
3 Kommentare
Bjorn Gustavsson
am 28 Mai 2019
That mapping simply takes the values of my d and puts values between -25 and -20 to values between 1 and 2, values between -20 and -15 will end up between 2 and 3 in the output - and so on. Therefore values between 0 and 1 will end up between 9 and 10 in the output (10 and 11, somewhere in the middle) and will occupy the same fraction of the range of output data as values between -25 and -20. If you have a book on image processing at hand you could look up histogram equalization, this is the same idea.
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