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    If p is different from n, then the rows of arr1 and arr2 are not the same lentgh. How do you compute their inner product in this case? Commented Oct 16, 2015 at 6:44
  • @M.Massias sorry meant to be m by n and p by n. They should have the same number of columns. Commented Oct 16, 2015 at 7:21