dsyconv3
Part of dsyconv.f(3).
Usage
Functions/Subroutines
DSYCONV
Function/Subroutine Documentation
subroutine dsyconv (character uplo, character way, integer n, double precision, dimension( lda, * ) a, integer lda, integer, dimension( * ) ipiv, double precision, dimension( * ) e, integer info)
DSYCONV
Purpose:
!> !> DSYCONV convert A given by TRF into L and D and vice-versa. !> Get Non-diag elements of D (returned in workspace) and !> apply or reverse permutation done in TRF. !>
Parameters
UPLO
!> UPLO is CHARACTER*1 !> Specifies whether the details of the factorization are stored !> as an upper or lower triangular matrix. !> = 'U': Upper triangular, form is A = U*D*U**T; !> = 'L': Lower triangular, form is A = L*D*L**T. !>
WAY
!> WAY is CHARACTER*1 !> = 'C': Convert !> = 'R': Revert !>
N
!> N is INTEGER !> The order of the matrix A. N >= 0. !>
A
!> A is DOUBLE PRECISION array, dimension (LDA,N) !> The block diagonal matrix D and the multipliers used to !> obtain the factor U or L as computed by DSYTRF. !>
LDA
!> LDA is INTEGER !> The leading dimension of the array A. LDA >= max(1,N). !>
IPIV
!> IPIV is INTEGER array, dimension (N) !> Details of the interchanges and the block structure of D !> as determined by DSYTRF. !>
E
!> E is DOUBLE PRECISION array, dimension (N) !> E stores the supdiagonal/subdiagonal of the symmetric 1-by-1 !> or 2-by-2 block diagonal matrix D in LDLT. !>
INFO
!> INFO is INTEGER !> = 0: successful exit !> < 0: if INFO = -i, the i-th argument had an illegal value !>
Author
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Definition at line 113 of file dsyconv.f.
History
- Arch Linux 2026-11-01: the text shown here
- Debian 12 (Bookworm)
- Debian 11 (Bullseye)
- Debian 10 (Buster)
- Debian 9 (Stretch)
- Debian 8 (Jessie)
- Debian 7 (Wheezy)