Efficient V'*S*V matrix multiplication?

1 vue (au cours des 30 derniers jours)
Henry Wolkowicz
Henry Wolkowicz le 18 Juin 2020
Modifié(e) : James Tursa le 18 Juin 2020
I have a matrix V with orthonormal columns, order n x k, and a symmetric, indefinite, matrix Z. Is there a lapack or blas routing to efficiently do the multiplication
V'*Z*V
If I do this in matlab, the result is NOT a symmetric matrix and has to be symmetrized and the result has roundoff of order 1e-13 for n approx 1,000
  1 commentaire
James Tursa
James Tursa le 18 Juin 2020
Modifié(e) : James Tursa le 18 Juin 2020
Do you have a C/C++ compiler installed where a mex routine could get at the BLAS symmetric matrix multiply routines directly? Are your matrices real or complex?

Connectez-vous pour commenter.

Réponses (0)

Catégories

En savoir plus sur Logical dans Help Center et File Exchange

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by