[SciPy-user] howto construct matrix A: dot(A.T, A) is positive-definite

Dominique Orban dominique.orban@gmail....
Fri Oct 5 11:58:54 CDT 2007


On 10/5/07, Robert Kern <robert.kern@gmail.com> wrote:
> Dominique Orban wrote:
>
> > I believe dot(X,Y) means X^T Y, so that dot(A.T, A) is in fact AA=A^2.
>
> No, this is not correct. dot() is simply matrix multiplication.

Isn't this counter-intuitive, given that for vectors, dot(u,v) is u^T v ?

Dominique


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