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cpttrf.f(3) | LAPACK | cpttrf.f(3) |
NAME¶
cpttrf.f -SYNOPSIS¶
Functions/Subroutines¶
subroutine cpttrf (N, D, E, INFO)
Function/Subroutine Documentation¶
subroutine cpttrf (integerN, real, dimension( * )D, complex, dimension( * )E, integerINFO)¶
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.
N
Author:
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 minor of order k is not positive definite; if k < N, the factorization could not be completed, while if k = N, the factorization was completed, but D(N) <= 0.
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Date:
September 2012
Definition at line 93 of file cpttrf.f.
Author¶
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