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How to visualize the matrix with colored entries

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Anastasiya
Anastasiya on 17 Jun 2013
Dear all, I have a matrix with some suspicious entries. I would like to show all entries (all numbers) and color by red my suspicious data. I have no idea how to do it:( Thanks!
  2 Comments
Anastasiya
Anastasiya on 17 Jun 2013
Thanks, Evan. I guess I would like to color certain data points by red, but having all the values.

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Answers (1)

Kye Taylor
Kye Taylor on 17 Jun 2013
Edited: Kye Taylor on 17 Jun 2013
What are the features that make your data suspicious? For example, if the suspicious data is all very large (say 2 standard deviations larger than the average datum), then you could try something like
% a proxy for your matrix
dataMatrix = randn(100,100);
% logical variable
isSuspect = dataMatrix > mean(dataMatrix(:))+2*std(dataMatrix(:));
% create an image where each pixel represents an entry in dataMatrix.
% the pixel will be red if isSuspect(i,j) is true
figure
imagesc(isSuspect.*dataMatrix)
% or (less exciting)
figure
imagesc(isSuspect)
  2 Comments
Fatemeh Sadeghihassanabadi
you can also try heatmap function:
https://www.mathworks.com/help/matlab/ref/heatmap.html

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