syconv(3)

Library Functions Manual

syconv(3)

NAME

syconv - syconv: convert to/from L and D from hetrf

SYNOPSIS

Functions

subroutine csyconv (uplo, way, n, a, lda, ipiv, e, info)
CSYCONV subroutine dsyconv (uplo, way, n, a, lda, ipiv, e, info)
DSYCONV subroutine ssyconv (uplo, way, n, a, lda, ipiv, e, info)
SSYCONV subroutine zsyconv (uplo, way, n, a, lda, ipiv, e, info)
ZSYCONV

Detailed Description

Function Documentation

subroutine csyconv (character uplo, character way, integer n, complex, dimension( lda, * ) a, integer lda, integer, dimension( * ) ipiv, complex, dimension( * ) e, integer info)

CSYCONV

Purpose:

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

!>          A is COMPLEX array, dimension (LDA,N)
!>          The block diagonal matrix D and the multipliers used to
!>          obtain the factor U or L as computed by CSYTRF.
!>

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 CSYTRF.
!>

!>          E is COMPLEX 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 csyconv.f.

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

!>          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 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.

subroutine ssyconv (character uplo, character way, integer n, real, dimension( lda, * ) a, integer lda, integer, dimension( * ) ipiv, real, dimension( * ) e, integer info)

SSYCONV

Purpose:

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

!>          A is REAL array, dimension (LDA,N)
!>          The block diagonal matrix D and the multipliers used to
!>          obtain the factor U or L as computed by SSYTRF.
!>

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 SSYTRF.
!>

!>          E is REAL 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 ssyconv.f.

subroutine zsyconv (character uplo, character way, integer n, complex16, dimension( lda, ) a, integer lda, integer, dimension( * ) ipiv, complex16, dimension( ) e, integer info)

ZSYCONV

Purpose:

!>
!> ZSYCONV converts A given by ZHETRF into L and D or vice-versa.
!> Get nondiagonal 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 is INTEGER
!>          The order of the matrix A.  N >= 0.
!>

!>          A is COMPLEX*16 array, dimension (LDA,N)
!>          The block diagonal matrix D and the multipliers used to
!>          obtain the factor U or L as computed by ZSYTRF.
!>

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 ZSYTRF.
!>

!>          E is COMPLEX*16 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 zsyconv.f.

Author

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