Is it possible to make contour graph with log scale colorbar?

So, basicaly it's all explained in the title. I would like to make contourf plot but in such a way that the colorbar is in log scale because I have quite a large range of values in my data.

I've read all the help on contour and contourf functions and colorbar but nothing useful can be found there.

Thank You in advance!

Answer 1

[Wayne King]

Sure just take the log() of the input matrix Z. I'm assuming your data are nonnegative.

   z = peaks;
   z = abs(z);
   contourf(log(z))
   colorbar

Or if you want it in "dB"

   contourf(10*log10(z))

[Marin]

Yeah this works fine, thank You :)

By the way, is there a way to manualy write labels on colorbar? What I mean is, when I plot

contourf(log10(z))

my colorbar has values 0, 1, 2, 3, ... is there any way I can get it to write 10^0, 10^1, 10^2, 10^3, ... ?