title: Correlation matrix and p-value combined in one matrix by column and row
body: <p>I have two matrices with the same dimensions and I would like to combine/merge them. I would like both matrices in the lower level of the combined matrix. 
  There is an example in stackoverflow where they have two symmetrical matrices of the same lengths (one contains correlation coefficients and the other contains p-values).But is not quite what I want. Thank you!</p>