# Making a heat map from three vectors of different lengths

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ct8 on 14 Nov 2022
Commented: ct8 on 14 Nov 2022
I have a set of attached three vectors (x,y,z) of different dimensions where the x column is the independent coordinates for all the columns in y at 10 different values of z. I want to generate a heat map of x,y and z where the color bar would denote z-values.
But it was erased from the database. Thanks!
Adam Danz on 14 Nov 2022
That answer was added in 2013 but matlab's heatmap came out in 2017. However, the bioinformatics Toolbox has a function HeatMap that has been available since 2009. My answer shows how to use the newer heatmap function. Note that you could also use imagesc to create a similar plot.

Adam Danz on 14 Nov 2022
Edited: Adam Danz on 14 Nov 2022
In heatmap, XData define the number of columns and YData define the number of rows. Your matrix y is 21x10 meaning there will be 21 rows and 10 columns.
heatmap(z,x,y) If you want there to be 10 rows and 21 columns,
figure
heatmap(x,z,y'); % note the transpose on y How to remove cell labels
The examples above do not show the cell labels because the axes are too small given the number of cells but to remove the cell labels,
h = heatmap(__)
h.CellLabelColor = 'none';
Alternative: imagesc
Another option is to use imagesc but note
• The direction of the y-axis differs between heatmap and imagesc
• imagesc sorts the x and y values
Yet another alternative is to use histogram2.
figure()
imagesc(z,x,y)
% reproduce heatmap's colormap
n=256;
cmap = [linspace(.9,0,n)', linspace(.9447,.447,n)', linspace(.9741,.741,n)'];
colormap(cmap);
axis xy
colorbar() ct8 on 14 Nov 2022
Neat! Thanks a lot!

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