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Logarithmic scale for colorbar

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Tom
Tom on 15 Apr 2015
Answered: Xiaolong on 26 Mar 2020 at 8:40
I sometimes require a plot which has a colorbar with a log scale. Previously I did this by setting the 'yscale' property of the underlying colorbar axes, but this no longer works with the new graphics system. Is there a workaround for the new system?

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Accepted Answer

Jonathan Campelli
Jonathan Campelli on 15 Apr 2015
Hello Tom,
My script plots sample data in logscale using "countourf", and both "YTick" and "YTickLabel" are set in "colorbar" on the last line:
Data=magic(100);
c=[1 10/3 10 100/3 100 1000/3 1000 10000/3 10000];
contourf(log(Data(:,:)),log(c));
colormap(bone); %Color palate named "bone"
caxis(log([c(1) c(length(c))]));
colorbar('FontSize',11,'YTick',log(c),'YTickLabel',c);
If this code does not meet your needs, let me know, and I will develop a more appropriate solution,
Best regards,
Jonathan Campelli

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Troy Dion
Troy Dion on 3 Aug 2017
Is there a way to make this work with scatter3?
Troy

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More Answers (1)

Xiaolong
Xiaolong on 26 Mar 2020 at 8:40
set(gca,'colorscale','log')

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