[SciPy-User] helmert implementation (7 parameters - geometric transformation)
Pauli Virtanen
pav+sp at iki.fi
Wed Mar 3 10:22:07 EST 2010
Wed, 03 Mar 2010 00:29:42 +0100, Massimo Di Stefano wrote:
> from here :
>
> http://docs.scipy.org/doc/numpy/reference/generated/
> numpy.linalg.cholesky.html
>
> seems it is applicable only on a square matrix. is that true ?
Cholesky decomposition works only on Hermitian matrices -- so being
square is one requirement.
Also, if you are going to do least-squares fitting, use linalg.lstsq; it
does the same thing as (A^T A)^-1 A^T b, but should be numerically more
stable.
--
Pauli Virtanen
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