LAPACK
3.4.2
LAPACK: Linear Algebra PACKage

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Functions/Subroutines  
subroutine  ssterf (N, D, E, INFO) 
SSTERF 
subroutine ssterf  (  integer  N, 
real, dimension( * )  D,  
real, dimension( * )  E,  
integer  INFO  
) 
SSTERF
Download SSTERF + dependencies [TGZ] [ZIP] [TXT]SSTERF computes all eigenvalues of a symmetric tridiagonal matrix using the PalWalkerKahan variant of the QL or QR algorithm.
[in]  N  N is INTEGER The order of the matrix. N >= 0. 
[in,out]  D  D is REAL array, dimension (N) On entry, the n diagonal elements of the tridiagonal matrix. On exit, if INFO = 0, the eigenvalues in ascending order. 
[in,out]  E  E is REAL array, dimension (N1) On entry, the (n1) subdiagonal elements of the tridiagonal matrix. On exit, E has been destroyed. 
[out]  INFO  INFO is INTEGER = 0: successful exit < 0: if INFO = i, the ith argument had an illegal value > 0: the algorithm failed to find all of the eigenvalues in a total of 30*N iterations; if INFO = i, then i elements of E have not converged to zero. 
Definition at line 87 of file ssterf.f.