Heatmap change selected cell color

How do I change color to specific cells on a heatmap?

The heatmap color is 'autumn', but I need to highlight specific cells with different color

Thank you

Answer 1

[Shubham Rawat]

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!

[Ilyass Boukhari]

Hello and thanks for coming to help!

I tried the code, but it seems it just reorders the cells in a different order (I might be wrong, so please let me know)

As an example: In a heatmap of 5x5, how to I change colour of specific cell (example only cells above 8 in black)? (and keeping the same 'autumn' map for the rest)

Hope it's clear

thanks again

[Shubham Rawat]

Hi Ilyass,

The matrix i have given here ([1 3 5; 2 4 6]) is the color indexing in autumn, and there is no black color in autumn colormap.

You may produce colormap of your choice:

mymap = autumn; %mymap is colormap matrix
mymap = [mymap; 0 0 0]; %[0 0 0] is color code for black

h = heatmap([1 2 3; 4 2 1; 5 5 5 ],'Colormap',mymap); % here last row is completely black

Hope This Helps!