Overlay imagesc and contour in subplot with different colour bars

Hi All,

I have an image i would like to produce as part of an array of 6, and I have the following code:

Unwrap = subplot(2,3,5);
hold on
imagesc(G_Unwrapped); title('Phase Change');colorbar, axis square
colormap(Unwrap,'gray')
contour(G_Unwrapped, 'ShowText','on');
hold off

However, as the axis handle applies to the whole subplot, and not the indervidual plot commands I can't think of a way to apply a second colour map too the contour plot.

Many thanks in advanced for any help!

Answer 1

[Adam Danz]

> the axis handle applies to the whole subplot, and not the indervidual plot commands

That's correct. A workaround is to assign two overlapping axes with care so that the axes are linked.

Follow this demo that carefully overlays imagesc and contour

https://www.mathworks.com/matlabcentral/answers/710113-how-do-i-plot-2-images-each-with-a-different-colormap-and-clim-in-a-single-subplot#answer_592283

You can easily add two independent colobars to the example above following this similar example,

https://www.mathworks.com/matlabcentral/answers/598141-how-do-i-create-a-colour-quiver-plot-colquiver-on-top-of-a-pcolor-depth-map#answer_498724

Give it a shot and if you get stuck, show us what you've got and I can nudge you in the right direction.

[Hugo Fortescue]

Hi there,

Thanks for those links. I have manged to follow them to get a single figure with 2 colourscales, but I'm not sure how to make it work for a subplot instead.

Wrap = subplot(2,3,5);
ax1 = axes(Wrap); 
ax2 = copyobj(ax1,Wrap);

This spits out a "Too many output arguments" error message

[Adam Danz]

This line doesn't make sense. Wrap is the axis handle.

ax1 = axes(Wrap);

The first 3 lines in the first link in my answer should look like this for subplots,

fig = clf();
ax1 = subplot(___); 
ax2 = copyobj(ax1,fig);
% then continue with the demo in the link

I tested that full solution using subplots in r2021a and it works well.