(x̄ - μ) in MATLAB

If we define A to be a 3x3 matrix with scalar values, is this correct?

zscore(A) = (x̄ - μ)row 1 + (x̄ - μ)row 2 + (x̄ - μ)row 3

or is there a different function to calculate this in Matlab without doing it all step by step in a gigantic matrix?

Answer 1

[Mischa Kim]

Ashley, zscore(A) can also be computed as

 n       = size(A,1);
 zScoreA = (A - ones(n,1)*mean(A))./(ones(n,1)*std(A));

[Ashley]

I apologize, I meant to ask:

For a 3x3 matrix in Matlab, how would I find this?

 = (x̄ - μ)row 1 + (x̄ - μ)row 2 + (x̄ - μ)row 3

[Mischa Kim]

This also works for a 3-by-3, of course:

 A       = rand(3,3); 
 n       = size(A,1);
 zScoreA = (A - ones(n,1)*mean(A))./(ones(n,1)*std(A))

With MATLAB you don't need to do it row by row or column by column. You can do it for the entire matrix at once. Is this what you mean?

[Ashley]

Yes! Thank you so much