# How to calculate the correlation coefficient between an array and a matrix?

I have a matrix A and a matrix B, with the same number of rows and a different number of columns. I need to calculate the correlation coefficient between each single columns of the matrix A and all the columns of the matrix B. For each column of A, the partial result will be an array, so I’m thinking to a matrix as final result.

Is there a way to do this avoiding the “for” cycle? Which is the most efficient way to do this? Could you suggest me the best syntax?

Finally, I have also to do the same with the mean squared error: again, in this second case, is it possible to avoid the “for” cycle?

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If you have the Statistics and Machine Learning Toolbox, it sounds like you want this:

`>> x = randn(20,3);>> y = x*[1 0;0 1;1 1];>> corr(x,y)ans =    0.9221   -0.1434   -0.2979    0.8438    0.6825    0.5606`

I’m not sure what you mean by mean squared error. The following adds some noise to get z, then computes coefficients for predicting y from z, then computes the sum of squared differences between y and the predicted values for each column. Does this point you in the right direction?

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