丁老师:

> Dear friends:
>     I want to diagonalize matrix D:
>                             D=PAP^(-1).
> where A is the diagonal matrix , P is the transformation matrix.
> Does Petsc has this routine to perform this task.
>

This is an eigenvalu/singular value decomposition of D. For dense D, you
can use Elemental, for sparse D, use Slepc.

Hong

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