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I want to find the standard deviation of each data point in the matrix.

Asked by Sophia Salazar on 13 Jun 2019
Latest activity Answered by Star Strider
on 13 Jun 2019
I have a matrix of data, where a majority of the data is close to zero. I want to find the standard deviation of each data point in the matrix. For example, if one point is two standard deviations away from zero I would like its value to represent that. I don't know exactly how the std fuction works but it doesn't appear do do what I want.

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1 Answer

Answer by Star Strider
on 13 Jun 2019
 Accepted Answer

If you have R2018a or later, use the normalize (link) funciton. It returns the z-scores of your data.
Otherwise, this produces the same result as normalize using the 'zscore' method:
x = randn(10,1); % Create Data Vector
zsc = (x-mean(x))./std(x); % Calculate Z-Score
Both operate primarily on columns, or on a single vector. The normalize function allows you to operate over rows as well.

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