I think that there is an error on test case numbe 1. http://en.wikipedia.org/wiki/Cofactor_(linear_algebra)
Please correct test case 1.
I believe the answer here should be -3, not 6.
Number of 1s in the Binary Representation of a Number
We love vectorized solutions. Problem 1 : remove the row average.
Put Two 1D matrices into one 1D matrix
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