# Valuation of top eigenvalues/eigenvectors only

Hi,

CPU time to perform Matrix diagonalization scales like n^3 where n is the size of the matrix. In many applications, however, one needs to know the top eigenvalues/eigenvectors only.

MKL provides this: "LAPACKE_dsyevr" where one can select how many eigenvalues one wants to compute.

Would be great if this functionality was available in mathnet!

**1**vote

AlexL
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