Overlay curves over heatmap

Hello everyone,

I was wondering if it is possible to plot curves over heatmap. It goes something like this:

X = 20:20:1000;
Y = 100:-2:1;
Z = randi(100,50,50);
h = heatmap(X,Y,Z);
hold on
for ii=1:5
   curve = ii+1000./X;
   plot(X, curve)
end
hold off

I want the curves to be above the heatmap. For example, in the figures below,

the right figure should be on top of the left figure.

Any ideas?

Thanks in advance!

Answer 1

[Akira Agata]

How about the following way?

1. Plot the heatmap
2. Add axes over the heatmap
3. Plot lines on the axes
4. Set the background color of the axes to 'none'
5. Adjust the axes size to fit to the heatmap

The following is an example.

% Sample data
cdata = [45 60 32; 43 54 76; 32 94 68; 23 95 58];

figure
heatmap(cdata)
colorbar
ax = axes;
plot(ax,magic(4),'LineWidth',2)
ax.Color = 'none';

% Maybe it needs some adjustment, like:
ax.Position(3) = 0.72;
ax.XTick = [];
ax.YTick = [];

[or ohev shalom]

Excellent! Thanks!

Another option I've found is to use pcolor instead of heatmap, with the cost of losing the written values inside the map...

[Chamila Siyamalapitiya]

How to apply this concept for subplot? when use ax = axes, it use the whole space, not the subplot space

[MJ]

Same question about subplot...

Answer 2

[Ahmed]

Use MATLAB's imagesc instead of heatmap