[Numpy-discussion] Example of numpy cov() not correct?

Pauli Virtanen pav@iki...
Thu Jul 31 03:14:10 CDT 2008

Wed, 30 Jul 2008 18:49:10 +0300, Nadav Horesh wrote:

> If you read the cov function documentation you'll see that if a second
> vector is given, it joins the 2 into one matrix and calculate the
> covariance of it. In your case, you are looking for the off-diagonal
> elements.

So the final answer to the OP's question is:

Yes, the example on


is wrong; cov(T,P) indeed returns a matrix. And it would be nice if 
someone fixed this, you can simply register a wiki account and fix the 

Pauli Virtanen

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