MATLAB: Extract data from heatmap

heatmap

I have plotted a heatmap using the built in "heatmap" function from a table that has xdata, ydata and zdata.

My X,Y data is jusy in a column with each on increasing.

The heatmap outputs the zdata to map the location given by xdata and ydata.

Is there away to extract this zdata as it appears (i.e. the positon) in the heatmap.

Thanks

Jason

Best Answer

Found it, use

h.ColorData

where h is the handle to the heatmap!

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MATLAB: Overlay curves over heatmap

How about the following way?

Plot the heatmap
Add axes over the heatmap
Plot lines on the axes
Set the background color of the axes to 'none'
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 = [];

MATLAB: Heatmap change selected cell color

Hi Ilyass,

You can use 'ColorData' property of Heatmap to change the colour of the cells.

Here is example code for that:

h = heatmap([1 3 5; 2 4 6],'Colormap',autumn);
h.ColorData = [4 5 6; 1 2 3];

Hope this Helps!

Best Answer

Related Solutions

MATLAB: Overlay curves over heatmap

MATLAB: Heatmap change selected cell color

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