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How can I make a logarithmic color plot and colorbar

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Robin Ramstad
Robin Ramstad 2018-4-6
评论： Walter Roberson 2018-11-21
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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回答（2 个）

Jeffrey Lestz
Jeffrey Lestz 2018-8-10
I have version 2018a, and the following also works for me:
set(gca,'colorscale','log')
Walter Roberson
Walter Roberson 2018-4-6
cb = colorbar();
cb.Ruler.Scale = 'log';
cb.Ruler.MinorTick = 'on';
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Jonah Pearl
Jonah Pearl 2018-11-20
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
Walter Roberson 2018-11-21
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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