what is different between 'corr' and 'corrcoef'?

I wanna compute correlation coefficient of two matrices,which function should I use? Thanks previously.

Answer 1

[Wayne King]

If you want a single correlation coefficient between two matrices, then neither, see corr2.

For two matrices, corr() returns the pairwise correlation between the columns of the two matrices if that is what you want.

If you input two matrices into corrcoef(), it converts the matrices to column vectors first and then just computes the correlation coefficient between those two vectors.

So for example:

   X = randn(8,8);
   Y = randn(8,8);
   corrcoef(X,Y)

is the same as

 X1 = X(:);
 Y1 = Y(:);
 corrcoef(X1,Y1)

[syen lai]

Thank you!

[Abhivyakti]

What if we enter one matrix to the above functions, i.e corr, corrcoef and corr2. ?

[Michael Moore]

I think that this answer is obsolete.