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