How can I make a logarithmic color plot and colorbar
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When working in Matlab 2014a I had a work-around to make logarithmic colorbars for my pcolor plots, making figures such as below.
After an institutional change to Matlab 2018a this workaround is completely broken, and it seems logarithmic colorbars with minor tickmarks are still not natively supported despite being a common type of plot. Is there any method to create this type of plot and colorbar in the newer releases?
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Answers (2)
Jeffrey Lestz
on 10 Aug 2018
I have version 2018a, and the following also works for me:
set(gca,'colorscale','log')
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Walter Roberson
on 6 Apr 2018
cb = colorbar();
cb.Ruler.Scale = 'log';
cb.Ruler.MinorTick = 'on';
6 Comments
Jonah Pearl
on 20 Nov 2018
Thank you, this works! @Antoine, your error is because you have some data equal to 0 in the Z-direction, and since log(0) is -Inf, the transform fails. Adding a very small number like 0.0001 to your Z-data should fix this. Or you could add in an if statement, if data == 0, add 0.0001.
Walter Roberson
on 21 Nov 2018
Jonah, the error message Antoine shows depends on version . It was a limitation between r2014b and r2017b that did not depend upon data being 0.
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