Removing outliers for a matrix

How can I remove outliers of a large matrix where an outlier is defined as a point more than three standard deviations from the mean of each column of the matrix.

I have this code but it works for a single vector, my data is in a matrix form

threshold = 3 * std( BQ);

validRange = mean(BQ) + [-1 1] * threshold;

dataWithoutOutliers = BQ(( data >= validRange(1) & data <= validRange(2) );

Answer 1

[Sulaymon Eshkabilov]

Use logical indexing.

[Kwasi Boateng]

Please how do I go about it am new to matlab

[Kwasi Boateng]

I have this code but it works for a single vector, my data is in a matrix form

threshold = 3 * std( BQ);

validRange = mean(BQ) + [-1 1] * threshold;

dataWithoutOutliers = BQ(( data >= validRange(1) & data <= validRange(2) );

[Sulaymon Eshkabilov]

In this case, you had better employ MATLAB's builtin function to remove outliers. See this help doc:

https://www.mathworks.com/help/matlab/ref/rmoutliers.html