[SciPy-dev] eig_banded

Arnd Baecker arnd.baecker at web.de
Fri Jun 30 08:06:37 CDT 2006


On Fri, 30 Jun 2006, Nils Wagner wrote:

>      Eigenvalues and Decompositions:
>
>        eig        --- Find the eigenvalues and vectors of a square matrix
>        eigvals    --- Find the eigenvalues of a square matrix
>        lu         --- LU decomposition of a matrix
>        lu_factor  --- LU decomposition returning unordered matrix and pivots
>        lu_solve   --- solve Ax=b using back substitution with output of
> lu_factor
>        svd        --- Singular value decomposition of a matrix
>        svdvals    --- Singular values of a matrix
>        diagsvd    --- construct matrix of singular values from output of svd
>        orth       --- construct orthonormal basis for range of A using svd
>        cholesky   --- Cholesky decomposition of a matrix
>        cho_factor --- Cholesky decomposition for use in solving linear
> system
>        cho_solve  --- Solve previously factored linear system
>        qr         --- QR decomposition of a matrix
>        schur      --- Schur decomposition of a matrix
>        rsf2csf    --- Real to complex schur form
>        hessenberg --- Hessenberg form of a matrix
>
> An entry for eig_banded is missing.

I added:

   eig_banded --- Find the eigenvalues and vectors of a band matrix
   eigvals_banded --- Find the eigenvalues of a band matrix

BTW:. what is the convention here about the formatting?
eig_banded fits (same length as hessenberg),
but eigvals_banded is too long?

Best, Arnd


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