how to plot a correlation matrix between two variables as a heatmap in matlab?

I have two variables which vary with each run of my code. I have to calculate the correlation matrix between these two variables. The matrix axes will be like variable X(first run),variable Y(first run),Variable X(second run),variable Y (second run)......I need to plot this correlation matrix as a heat map?

please help me

Answer 1

[Riz]

Just perform Pearson or Spearman correlation depending on your data. Then display the resulting matrix as an image and apply any colormap of your choice.

%% Code Snippet
corr(yourvariables)
imagesc(ans); % Display correlation matrix as an image
set(gca, 'XTick', 1:sizeofyourcorrmatrix); % center x-axis ticks on bins
set(gca, 'YTick', 1:nsizeofyourcorrmatrix); % center y-axis ticks on bins
set(gca, 'XTickLabel', yourlabelnames); % set x-axis labels
set(gca, 'YTickLabel', yourlabelnames); % set y-axis labels
title('Your Title', 'FontSize', 10); % set title
colormap('jet'); % Choose jet or any other color scheme
colorbar on; % 

[Nilima Gautam]

Thank you Riz for sharing this code it helps me but i have an problem to giving lables name.

Please help me if you have any information about this

Thank you

[Martim Zurita]

Nilima, write xlabel('Example 1') and ylabel('Example 2') to put names in the x and y axis. See more at https://www.mathworks.com/help/matlab/ref/xlabel.html.

[Michelle Wagner]

How do add a scale to this?

Answer 2

[Niyati Chokshi]

I have four variables- 3 of them are caluating the fourth one, thus mismatch of the lengths/dimension. . How do I use imagesc and corr for that?