Logarithmic scale for colorbar

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?

[Walter Roberson]

https://www.mathworks.com/matlabcentral/answers/100066-how-do-i-create-a-logarithmic-scale-colormap-or-colorbar

Answer 1

[Jonathan Campelli]

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

[Troy Dion]

Is there a way to make this work with scatter3?

Troy

[Bo Wang]

its a really nice answer to me , thanks !

Answer 2

[Xiaolong]

set(gca,'colorscale','log')

[Walter Roberson]

Note: that was not available at the time the question was originally asked.