lahef_aa - Man Page

la{he,sy}f_aa: triangular factor partial factor

Synopsis

Functions

subroutine clahef_aa (uplo, j1, m, nb, a, lda, ipiv, h, ldh, work)
CLAHEF_AA
subroutine clasyf_aa (uplo, j1, m, nb, a, lda, ipiv, h, ldh, work)
CLASYF_AA
subroutine dlasyf_aa (uplo, j1, m, nb, a, lda, ipiv, h, ldh, work)
DLASYF_AA
subroutine slasyf_aa (uplo, j1, m, nb, a, lda, ipiv, h, ldh, work)
SLASYF_AA
subroutine zlahef_aa (uplo, j1, m, nb, a, lda, ipiv, h, ldh, work)
ZLAHEF_AA
subroutine zlasyf_aa (uplo, j1, m, nb, a, lda, ipiv, h, ldh, work)
ZLASYF_AA

Detailed Description

Function Documentation

subroutine clahef_aa (character uplo, integer j1, integer m, integer nb, complex, dimension( lda, * ) a, integer lda, integer, dimension( * ) ipiv, complex, dimension( ldh, * ) h, integer ldh, complex, dimension( * ) work)

CLAHEF_AA  

Purpose:

 CLAHEF_AA factorizes a panel of a complex hermitian matrix A using
 the Aasen's algorithm. The panel consists of a set of NB rows of A
 when UPLO is U, or a set of NB columns when UPLO is L.

 In order to factorize the panel, the Aasen's algorithm requires the
 last row, or column, of the previous panel. The first row, or column,
 of A is set to be the first row, or column, of an identity matrix,
 which is used to factorize the first panel.

 The resulting J-th row of U, or J-th column of L, is stored in the
 (J-1)-th row, or column, of A (without the unit diagonals), while
 the diagonal and subdiagonal of A are overwritten by those of T.
Parameters

UPLO

          UPLO is CHARACTER*1
          = 'U':  Upper triangle of A is stored;
          = 'L':  Lower triangle of A is stored.

J1

          J1 is INTEGER
          The location of the first row, or column, of the panel
          within the submatrix of A, passed to this routine, e.g.,
          when called by CHETRF_AA, for the first panel, J1 is 1,
          while for the remaining panels, J1 is 2.

M

          M is INTEGER
          The dimension of the submatrix. M >= 0.

NB

          NB is INTEGER
          The dimension of the panel to be facotorized.

A

          A is COMPLEX array, dimension (LDA,M) for
          the first panel, while dimension (LDA,M+1) for the
          remaining panels.

          On entry, A contains the last row, or column, of
          the previous panel, and the trailing submatrix of A
          to be factorized, except for the first panel, only
          the panel is passed.

          On exit, the leading panel is factorized.

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 row and column interchanges,
          the row and column k were interchanged with the row and
          column IPIV(k).

H

          H is COMPLEX workspace, dimension (LDH,NB).

LDH

          LDH is INTEGER
          The leading dimension of the workspace H. LDH >= max(1,M).

WORK

          WORK is COMPLEX workspace, dimension (M).
Author

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Definition at line 142 of file clahef_aa.f.

subroutine clasyf_aa (character uplo, integer j1, integer m, integer nb, complex, dimension( lda, * ) a, integer lda, integer, dimension( * ) ipiv, complex, dimension( ldh, * ) h, integer ldh, complex, dimension( * ) work)

CLASYF_AA  

Purpose:

 DLATRF_AA factorizes a panel of a complex symmetric matrix A using
 the Aasen's algorithm. The panel consists of a set of NB rows of A
 when UPLO is U, or a set of NB columns when UPLO is L.

 In order to factorize the panel, the Aasen's algorithm requires the
 last row, or column, of the previous panel. The first row, or column,
 of A is set to be the first row, or column, of an identity matrix,
 which is used to factorize the first panel.

 The resulting J-th row of U, or J-th column of L, is stored in the
 (J-1)-th row, or column, of A (without the unit diagonals), while
 the diagonal and subdiagonal of A are overwritten by those of T.
Parameters

UPLO

          UPLO is CHARACTER*1
          = 'U':  Upper triangle of A is stored;
          = 'L':  Lower triangle of A is stored.

J1

          J1 is INTEGER
          The location of the first row, or column, of the panel
          within the submatrix of A, passed to this routine, e.g.,
          when called by CSYTRF_AA, for the first panel, J1 is 1,
          while for the remaining panels, J1 is 2.

M

          M is INTEGER
          The dimension of the submatrix. M >= 0.

NB

          NB is INTEGER
          The dimension of the panel to be facotorized.

A

          A is COMPLEX array, dimension (LDA,M) for
          the first panel, while dimension (LDA,M+1) for the
          remaining panels.

          On entry, A contains the last row, or column, of
          the previous panel, and the trailing submatrix of A
          to be factorized, except for the first panel, only
          the panel is passed.

          On exit, the leading panel is factorized.

LDA

          LDA is INTEGER
          The leading dimension of the array A.  LDA >= max(1,M).

IPIV

          IPIV is INTEGER array, dimension (M)
          Details of the row and column interchanges,
          the row and column k were interchanged with the row and
          column IPIV(k).

H

          H is COMPLEX workspace, dimension (LDH,NB).

LDH

          LDH is INTEGER
          The leading dimension of the workspace H. LDH >= max(1,M).

WORK

          WORK is COMPLEX workspace, dimension (M).
Author

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Definition at line 142 of file clasyf_aa.f.

subroutine dlasyf_aa (character uplo, integer j1, integer m, integer nb, double precision, dimension( lda, * ) a, integer lda, integer, dimension( * ) ipiv, double precision, dimension( ldh, * ) h, integer ldh, double precision, dimension( * ) work)

DLASYF_AA  

Purpose:

 DLATRF_AA factorizes a panel of a real symmetric matrix A using
 the Aasen's algorithm. The panel consists of a set of NB rows of A
 when UPLO is U, or a set of NB columns when UPLO is L.

 In order to factorize the panel, the Aasen's algorithm requires the
 last row, or column, of the previous panel. The first row, or column,
 of A is set to be the first row, or column, of an identity matrix,
 which is used to factorize the first panel.

 The resulting J-th row of U, or J-th column of L, is stored in the
 (J-1)-th row, or column, of A (without the unit diagonals), while
 the diagonal and subdiagonal of A are overwritten by those of T.
Parameters

UPLO

          UPLO is CHARACTER*1
          = 'U':  Upper triangle of A is stored;
          = 'L':  Lower triangle of A is stored.

J1

          J1 is INTEGER
          The location of the first row, or column, of the panel
          within the submatrix of A, passed to this routine, e.g.,
          when called by DSYTRF_AA, for the first panel, J1 is 1,
          while for the remaining panels, J1 is 2.

M

          M is INTEGER
          The dimension of the submatrix. M >= 0.

NB

          NB is INTEGER
          The dimension of the panel to be facotorized.

A

          A is DOUBLE PRECISION array, dimension (LDA,M) for
          the first panel, while dimension (LDA,M+1) for the
          remaining panels.

          On entry, A contains the last row, or column, of
          the previous panel, and the trailing submatrix of A
          to be factorized, except for the first panel, only
          the panel is passed.

          On exit, the leading panel is factorized.

LDA

          LDA is INTEGER
          The leading dimension of the array A.  LDA >= max(1,M).

IPIV

          IPIV is INTEGER array, dimension (M)
          Details of the row and column interchanges,
          the row and column k were interchanged with the row and
          column IPIV(k).

H

          H is DOUBLE PRECISION workspace, dimension (LDH,NB).

LDH

          LDH is INTEGER
          The leading dimension of the workspace H. LDH >= max(1,M).

WORK

          WORK is DOUBLE PRECISION workspace, dimension (M).
Author

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Definition at line 142 of file dlasyf_aa.f.

subroutine slasyf_aa (character uplo, integer j1, integer m, integer nb, real, dimension( lda, * ) a, integer lda, integer, dimension( * ) ipiv, real, dimension( ldh, * ) h, integer ldh, real, dimension( * ) work)

SLASYF_AA  

Purpose:

 DLATRF_AA factorizes a panel of a real symmetric matrix A using
 the Aasen's algorithm. The panel consists of a set of NB rows of A
 when UPLO is U, or a set of NB columns when UPLO is L.

 In order to factorize the panel, the Aasen's algorithm requires the
 last row, or column, of the previous panel. The first row, or column,
 of A is set to be the first row, or column, of an identity matrix,
 which is used to factorize the first panel.

 The resulting J-th row of U, or J-th column of L, is stored in the
 (J-1)-th row, or column, of A (without the unit diagonals), while
 the diagonal and subdiagonal of A are overwritten by those of T.
Parameters

UPLO

          UPLO is CHARACTER*1
          = 'U':  Upper triangle of A is stored;
          = 'L':  Lower triangle of A is stored.

J1

          J1 is INTEGER
          The location of the first row, or column, of the panel
          within the submatrix of A, passed to this routine, e.g.,
          when called by SSYTRF_AA, for the first panel, J1 is 1,
          while for the remaining panels, J1 is 2.

M

          M is INTEGER
          The dimension of the submatrix. M >= 0.

NB

          NB is INTEGER
          The dimension of the panel to be facotorized.

A

          A is REAL array, dimension (LDA,M) for
          the first panel, while dimension (LDA,M+1) for the
          remaining panels.

          On entry, A contains the last row, or column, of
          the previous panel, and the trailing submatrix of A
          to be factorized, except for the first panel, only
          the panel is passed.

          On exit, the leading panel is factorized.

LDA

          LDA is INTEGER
          The leading dimension of the array A.  LDA >= max(1,M).

IPIV

          IPIV is INTEGER array, dimension (M)
          Details of the row and column interchanges,
          the row and column k were interchanged with the row and
          column IPIV(k).

H

          H is REAL workspace, dimension (LDH,NB).

LDH

          LDH is INTEGER
          The leading dimension of the workspace H. LDH >= max(1,M).

WORK

          WORK is REAL workspace, dimension (M).
Author

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Definition at line 142 of file slasyf_aa.f.

subroutine zlahef_aa (character uplo, integer j1, integer m, integer nb, complex*16, dimension( lda, * ) a, integer lda, integer, dimension( * ) ipiv, complex*16, dimension( ldh, * ) h, integer ldh, complex*16, dimension( * ) work)

ZLAHEF_AA  

Purpose:

 DLAHEF_AA factorizes a panel of a complex hermitian matrix A using
 the Aasen's algorithm. The panel consists of a set of NB rows of A
 when UPLO is U, or a set of NB columns when UPLO is L.

 In order to factorize the panel, the Aasen's algorithm requires the
 last row, or column, of the previous panel. The first row, or column,
 of A is set to be the first row, or column, of an identity matrix,
 which is used to factorize the first panel.

 The resulting J-th row of U, or J-th column of L, is stored in the
 (J-1)-th row, or column, of A (without the unit diagonals), while
 the diagonal and subdiagonal of A are overwritten by those of T.
Parameters

UPLO

          UPLO is CHARACTER*1
          = 'U':  Upper triangle of A is stored;
          = 'L':  Lower triangle of A is stored.

J1

          J1 is INTEGER
          The location of the first row, or column, of the panel
          within the submatrix of A, passed to this routine, e.g.,
          when called by ZHETRF_AA, for the first panel, J1 is 1,
          while for the remaining panels, J1 is 2.

M

          M is INTEGER
          The dimension of the submatrix. M >= 0.

NB

          NB is INTEGER
          The dimension of the panel to be facotorized.

A

          A is COMPLEX*16 array, dimension (LDA,M) for
          the first panel, while dimension (LDA,M+1) for the
          remaining panels.

          On entry, A contains the last row, or column, of
          the previous panel, and the trailing submatrix of A
          to be factorized, except for the first panel, only
          the panel is passed.

          On exit, the leading panel is factorized.

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 row and column interchanges,
          the row and column k were interchanged with the row and
          column IPIV(k).

H

          H is COMPLEX*16 workspace, dimension (LDH,NB).

LDH

          LDH is INTEGER
          The leading dimension of the workspace H. LDH >= max(1,M).

WORK

          WORK is COMPLEX*16 workspace, dimension (M).
Author

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Definition at line 142 of file zlahef_aa.f.

subroutine zlasyf_aa (character uplo, integer j1, integer m, integer nb, complex*16, dimension( lda, * ) a, integer lda, integer, dimension( * ) ipiv, complex*16, dimension( ldh, * ) h, integer ldh, complex*16, dimension( * ) work)

ZLASYF_AA  

Purpose:

 DLATRF_AA factorizes a panel of a complex symmetric matrix A using
 the Aasen's algorithm. The panel consists of a set of NB rows of A
 when UPLO is U, or a set of NB columns when UPLO is L.

 In order to factorize the panel, the Aasen's algorithm requires the
 last row, or column, of the previous panel. The first row, or column,
 of A is set to be the first row, or column, of an identity matrix,
 which is used to factorize the first panel.

 The resulting J-th row of U, or J-th column of L, is stored in the
 (J-1)-th row, or column, of A (without the unit diagonals), while
 the diagonal and subdiagonal of A are overwritten by those of T.
Parameters

UPLO

          UPLO is CHARACTER*1
          = 'U':  Upper triangle of A is stored;
          = 'L':  Lower triangle of A is stored.

J1

          J1 is INTEGER
          The location of the first row, or column, of the panel
          within the submatrix of A, passed to this routine, e.g.,
          when called by ZSYTRF_AA, for the first panel, J1 is 1,
          while for the remaining panels, J1 is 2.

M

          M is INTEGER
          The dimension of the submatrix. M >= 0.

NB

          NB is INTEGER
          The dimension of the panel to be facotorized.

A

          A is COMPLEX*16 array, dimension (LDA,M) for
          the first panel, while dimension (LDA,M+1) for the
          remaining panels.

          On entry, A contains the last row, or column, of
          the previous panel, and the trailing submatrix of A
          to be factorized, except for the first panel, only
          the panel is passed.

          On exit, the leading panel is factorized.

LDA

          LDA is INTEGER
          The leading dimension of the array A.  LDA >= max(1,M).

IPIV

          IPIV is INTEGER array, dimension (M)
          Details of the row and column interchanges,
          the row and column k were interchanged with the row and
          column IPIV(k).

H

          H is COMPLEX*16 workspace, dimension (LDH,NB).

LDH

          LDH is INTEGER
          The leading dimension of the workspace H. LDH >= max(1,M).

WORK

          WORK is COMPLEX*16 workspace, dimension (M).
Author

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Definition at line 142 of file zlasyf_aa.f.

Author

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Tue Nov 28 2023 12:08:43 Version 3.12.0 LAPACK