cpttrf.f - Man Page

SRC/cpttrf.f

Synopsis

Functions/Subroutines

subroutine cpttrf (n, d, e, info)
CPTTRF

Function/Subroutine Documentation

subroutine cpttrf (integer n, real, dimension( * ) d, complex, dimension( * ) e, integer info)

CPTTRF  

Purpose:

 CPTTRF computes the L*D*L**H factorization of a complex Hermitian
 positive definite tridiagonal matrix A.  The factorization may also
 be regarded as having the form A = U**H *D*U.
Parameters

N

          N is INTEGER
          The order of the matrix A.  N >= 0.

D

          D is REAL array, dimension (N)
          On entry, the n diagonal elements of the tridiagonal matrix
          A.  On exit, the n diagonal elements of the diagonal matrix
          D from the L*D*L**H factorization of A.

E

          E is COMPLEX array, dimension (N-1)
          On entry, the (n-1) subdiagonal elements of the tridiagonal
          matrix A.  On exit, the (n-1) subdiagonal elements of the
          unit bidiagonal factor L from the L*D*L**H factorization of A.
          E can also be regarded as the superdiagonal of the unit
          bidiagonal factor U from the U**H *D*U factorization of A.

INFO

          INFO is INTEGER
          = 0: successful exit
          < 0: if INFO = -k, the k-th argument had an illegal value
          > 0: if INFO = k, the leading principal minor of order k
               is not positive; if k < N, the factorization could not
               be completed, while if k = N, the factorization was
               completed, but D(N) <= 0.
Author

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Definition at line 91 of file cpttrf.f.

Author

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Referenced By

The man page cpttrf(3) is an alias of cpttrf.f(3).

Tue Nov 28 2023 12:08:41 Version 3.12.0 LAPACK