scipy.linalg.lapack.ssterf

scipy.linalg.lapack.ssterf(d, e, overwrite_d=0, overwrite_e=0) = <flapack function ssterf>

Compute all eigenvalues of a symmetric tridiagonal matrix by the Pal-Walker- Kahan QL/QR variant, without eigenvectors (LAPACK ssterf).

Parameters:

dndarray

Diagonal elements of the symmetric tridiagonal matrix, length n.

endarray

Off-diagonal elements, length n - 1.

overwrite_dint, optional

If nonzero, d may be overwritten in place. Default is 0.

overwrite_eint, optional

If nonzero, e may be overwritten in place. Default is 0.

Returns:

valsndarray

Eigenvalues in ascending order, written over d.

infoint

0 on success; if negative, the -info-th argument had an illegal value; if positive, the algorithm failed to converge.