How to visualize the matrix with colored entries

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Anastasiya
Anastasiya 2013-6-17
评论： Fatemeh Sadeghihassanabadi 2021-5-4
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 个评论
Evan
Evan 2013-6-17
编辑：Evan 2013-6-17
Do you mean you want to visualize the data graphically and color certain datapoints red, or are you saying you'd like certain elements to be red when you call the matrix from the command window?
Anastasiya
Anastasiya 2013-6-17
Thanks, Evan. I guess I would like to color certain data points by red, but having all the values.

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回答（1 个）

Kye Taylor
Kye Taylor 2013-6-17
编辑：Kye Taylor 2013-6-17
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 个评论
Anastasiya
Anastasiya 2013-6-17
编辑：Anastasiya 2013-6-17
Thanks Kye! Yes, I can do imagesc, but I also would like to see real values of entries (a table or so). And I have my own functions to identify suspicious data(outliers)...
Fatemeh Sadeghihassanabadi
Fatemeh Sadeghihassanabadi 2021-5-4
you can also try heatmap function:
https://www.mathworks.com/help/matlab/ref/heatmap.html

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