syconvf(3)

NAME
syconvf - syconvf: convert to/from hetrf to hetrf_rk format

SYNOPSIS

  Functions
subroutine csyconvf (uplo, way, n, a, lda, e, ipiv, info)
CSYCONVF
subroutine dsyconvf (uplo, way, n, a, lda, e, ipiv, info)
DSYCONVF
subroutine ssyconvf (uplo, way, n, a, lda, e, ipiv, info)
SSYCONVF
subroutine zsyconvf (uplo, way, n, a, lda, e, ipiv, info)
ZSYCONVF

Detailed Description

Function Documentation

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

CSYCONVF

Purpose:

    !> If parameter WAY = 'C':
    !> CSYCONVF converts the factorization output format used in
    !> CSYTRF provided on entry in parameter A into the factorization
    !> output format used in CSYTRF_RK (or CSYTRF_BK) that is stored
    !> on exit in parameters A and E. It also converts in place details of
    !> the interchanges stored in IPIV from the format used in CSYTRF into
    !> the format used in CSYTRF_RK (or CSYTRF_BK).
    !>
    !> If parameter WAY = 'R':
    !> CSYCONVF performs the conversion in reverse direction, i.e.
    !> converts the factorization output format used in CSYTRF_RK
    !> (or CSYTRF_BK) provided on entry in parameters A and E into
    !> the factorization output format used in CSYTRF that is stored
    !> on exit in parameter A. It also converts in place details of
    !> the interchanges stored in IPIV from the format used in CSYTRF_RK
    !> (or CSYTRF_BK) into the format used in CSYTRF.
    !>
    !> CSYCONVF can also convert in Hermitian matrix case, i.e. between
    !> formats used in CHETRF and CHETRF_RK (or CHETRF_BK).
    !>

Parameters
    UPLO

    !>          UPLO is CHARACTER*1
    !>          Specifies whether the details of the factorization are
    !>          stored as an upper or lower triangular matrix A.
    !>          = 'U':  Upper triangular
    !>          = 'L':  Lower triangular
    !>

    WAY

    !>          WAY is CHARACTER*1
    !>          = 'C': Convert
    !>          = 'R': Revert
    !>

    N

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

    A

    !>          A is COMPLEX array, dimension (LDA,N)
    !>
    !>          1) If WAY ='C':
    !>
    !>          On entry, contains factorization details in format used in
    !>          CSYTRF:
    !>            a) all elements of the symmetric block diagonal
    !>               matrix D on the diagonal of A and on superdiagonal
    !>               (or subdiagonal) of A, and
    !>            b) If UPLO = 'U': multipliers used to obtain factor U
    !>               in the superdiagonal part of A.
    !>               If UPLO = 'L': multipliers used to obtain factor L
    !>               in the superdiagonal part of A.
    !>
    !>          On exit, contains factorization details in format used in
    !>          CSYTRF_RK or CSYTRF_BK:
    !>            a) ONLY diagonal elements of the symmetric block diagonal
    !>               matrix D on the diagonal of A, i.e. D(k,k) = A(k,k);
    !>               (superdiagonal (or subdiagonal) elements of D
    !>                are stored on exit in array E), and
    !>            b) If UPLO = 'U': factor U in the superdiagonal part of A.
    !>               If UPLO = 'L': factor L in the subdiagonal part of A.
    !>
    !>          2) If WAY = 'R':
    !>
    !>          On entry, contains factorization details in format used in
    !>          CSYTRF_RK or CSYTRF_BK:
    !>            a) ONLY diagonal elements of the symmetric block diagonal
    !>               matrix D on the diagonal of A, i.e. D(k,k) = A(k,k);
    !>               (superdiagonal (or subdiagonal) elements of D
    !>                are stored on exit in array E), and
    !>            b) If UPLO = 'U': factor U in the superdiagonal part of A.
    !>               If UPLO = 'L': factor L in the subdiagonal part of A.
    !>
    !>          On exit, contains factorization details in format used in
    !>          CSYTRF:
    !>            a) all elements of the symmetric block diagonal
    !>               matrix D on the diagonal of A and on superdiagonal
    !>               (or subdiagonal) of A, and
    !>            b) If UPLO = 'U': multipliers used to obtain factor U
    !>               in the superdiagonal part of A.
    !>               If UPLO = 'L': multipliers used to obtain factor L
    !>               in the superdiagonal part of A.
    !>

    LDA

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

    E

    !>          E is COMPLEX array, dimension (N)
    !>
    !>          1) If WAY ='C':
    !>
    !>          On entry, just a workspace.
    !>
    !>          On exit, contains the superdiagonal (or subdiagonal)
    !>          elements of the symmetric block diagonal matrix D
    !>          with 1-by-1 or 2-by-2 diagonal blocks, where
    !>          If UPLO = 'U': E(i) = D(i-1,i), i=2:N, E(1) is set to 0;
    !>          If UPLO = 'L': E(i) = D(i+1,i), i=1:N-1, E(N) is set to 0.
    !>
    !>          2) If WAY = 'R':
    !>
    !>          On entry, contains the superdiagonal (or subdiagonal)
    !>          elements of the symmetric block diagonal matrix D
    !>          with 1-by-1 or 2-by-2 diagonal blocks, where
    !>          If UPLO = 'U': E(i) = D(i-1,i),i=2:N, E(1) not referenced;
    !>          If UPLO = 'L': E(i) = D(i+1,i),i=1:N-1, E(N) not referenced.
    !>
    !>          On exit, is not changed
    !>

    IPIV

    !>          IPIV is INTEGER array, dimension (N)
    !>
    !>          1) If WAY ='C':
    !>          On entry, details of the interchanges and the block
    !>          structure of D in the format used in CSYTRF.
    !>          On exit, details of the interchanges and the block
    !>          structure of D in the format used in CSYTRF_RK
    !>          ( or CSYTRF_BK).
    !>
    !>          1) If WAY ='R':
    !>          On entry, details of the interchanges and the block
    !>          structure of D in the format used in CSYTRF_RK
    !>          ( or CSYTRF_BK).
    !>          On exit, details of the interchanges and the block
    !>          structure of D in the format used in CSYTRF.
    !>

    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.

Contributors:

    !>
    !>  November 2017,  Igor Kozachenko,
    !>                  Computer Science Division,
    !>                  University of California, Berkeley
    !>
    !>

Definition at line 208 of file csyconvf.f.

  subroutine dsyconvf (character uplo, character way, integer n, double precision, dimension( lda, * ) a, integer lda, double precision, dimension( * ) e, integer, dimension( * ) ipiv, integer info)

DSYCONVF

Purpose:

    !> If parameter WAY = 'C':
    !> DSYCONVF converts the factorization output format used in
    !> DSYTRF provided on entry in parameter A into the factorization
    !> output format used in DSYTRF_RK (or DSYTRF_BK) that is stored
    !> on exit in parameters A and E. It also converts in place details of
    !> the interchanges stored in IPIV from the format used in DSYTRF into
    !> the format used in DSYTRF_RK (or DSYTRF_BK).
    !>
    !> If parameter WAY = 'R':
    !> DSYCONVF performs the conversion in reverse direction, i.e.
    !> converts the factorization output format used in DSYTRF_RK
    !> (or DSYTRF_BK) provided on entry in parameters A and E into
    !> the factorization output format used in DSYTRF that is stored
    !> on exit in parameter A. It also converts in place details of
    !> the interchanges stored in IPIV from the format used in DSYTRF_RK
    !> (or DSYTRF_BK) into the format used in DSYTRF.
    !>

Parameters
    UPLO

    !>          UPLO is CHARACTER*1
    !>          Specifies whether the details of the factorization are
    !>          stored as an upper or lower triangular matrix A.
    !>          = 'U':  Upper triangular
    !>          = 'L':  Lower triangular
    !>

    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)
    !>
    !>          1) If WAY ='C':
    !>
    !>          On entry, contains factorization details in format used in
    !>          DSYTRF:
    !>            a) all elements of the symmetric block diagonal
    !>               matrix D on the diagonal of A and on superdiagonal
    !>               (or subdiagonal) of A, and
    !>            b) If UPLO = 'U': multipliers used to obtain factor U
    !>               in the superdiagonal part of A.
    !>               If UPLO = 'L': multipliers used to obtain factor L
    !>               in the superdiagonal part of A.
    !>
    !>          On exit, contains factorization details in format used in
    !>          DSYTRF_RK or DSYTRF_BK:
    !>            a) ONLY diagonal elements of the symmetric block diagonal
    !>               matrix D on the diagonal of A, i.e. D(k,k) = A(k,k);
    !>               (superdiagonal (or subdiagonal) elements of D
    !>                are stored on exit in array E), and
    !>            b) If UPLO = 'U': factor U in the superdiagonal part of A.
    !>               If UPLO = 'L': factor L in the subdiagonal part of A.
    !>
    !>          2) If WAY = 'R':
    !>
    !>          On entry, contains factorization details in format used in
    !>          DSYTRF_RK or DSYTRF_BK:
    !>            a) ONLY diagonal elements of the symmetric block diagonal
    !>               matrix D on the diagonal of A, i.e. D(k,k) = A(k,k);
    !>               (superdiagonal (or subdiagonal) elements of D
    !>                are stored on exit in array E), and
    !>            b) If UPLO = 'U': factor U in the superdiagonal part of A.
    !>               If UPLO = 'L': factor L in the subdiagonal part of A.
    !>
    !>          On exit, contains factorization details in format used in
    !>          DSYTRF:
    !>            a) all elements of the symmetric block diagonal
    !>               matrix D on the diagonal of A and on superdiagonal
    !>               (or subdiagonal) of A, and
    !>            b) If UPLO = 'U': multipliers used to obtain factor U
    !>               in the superdiagonal part of A.
    !>               If UPLO = 'L': multipliers used to obtain factor L
    !>               in the superdiagonal part of A.
    !>

    LDA

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

    E

    !>          E is DOUBLE PRECISION array, dimension (N)
    !>
    !>          1) If WAY ='C':
    !>
    !>          On entry, just a workspace.
    !>
    !>          On exit, contains the superdiagonal (or subdiagonal)
    !>          elements of the symmetric block diagonal matrix D
    !>          with 1-by-1 or 2-by-2 diagonal blocks, where
    !>          If UPLO = 'U': E(i) = D(i-1,i), i=2:N, E(1) is set to 0;
    !>          If UPLO = 'L': E(i) = D(i+1,i), i=1:N-1, E(N) is set to 0.
    !>
    !>          2) If WAY = 'R':
    !>
    !>          On entry, contains the superdiagonal (or subdiagonal)
    !>          elements of the symmetric block diagonal matrix D
    !>          with 1-by-1 or 2-by-2 diagonal blocks, where
    !>          If UPLO = 'U': E(i) = D(i-1,i),i=2:N, E(1) not referenced;
    !>          If UPLO = 'L': E(i) = D(i+1,i),i=1:N-1, E(N) not referenced.
    !>
    !>          On exit, is not changed
    !>

    IPIV

    !>          IPIV is INTEGER array, dimension (N)
    !>
    !>          1) If WAY ='C':
    !>          On entry, details of the interchanges and the block
    !>          structure of D in the format used in DSYTRF.
    !>          On exit, details of the interchanges and the block
    !>          structure of D in the format used in DSYTRF_RK
    !>          ( or DSYTRF_BK).
    !>
    !>          1) If WAY ='R':
    !>          On entry, details of the interchanges and the block
    !>          structure of D in the format used in DSYTRF_RK
    !>          ( or DSYTRF_BK).
    !>          On exit, details of the interchanges and the block
    !>          structure of D in the format used in DSYTRF.
    !>

    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.

Contributors:

    !>
    !>  November 2017,  Igor Kozachenko,
    !>                  Computer Science Division,
    !>                  University of California, Berkeley
    !>
    !>

Definition at line 205 of file dsyconvf.f.

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

SSYCONVF

Purpose:

    !> If parameter WAY = 'C':
    !> SSYCONVF converts the factorization output format used in
    !> SSYTRF provided on entry in parameter A into the factorization
    !> output format used in SSYTRF_RK (or SSYTRF_BK) that is stored
    !> on exit in parameters A and E. It also converts in place details of
    !> the interchanges stored in IPIV from the format used in SSYTRF into
    !> the format used in SSYTRF_RK (or SSYTRF_BK).
    !>
    !> If parameter WAY = 'R':
    !> SSYCONVF performs the conversion in reverse direction, i.e.
    !> converts the factorization output format used in SSYTRF_RK
    !> (or SSYTRF_BK) provided on entry in parameters A and E into
    !> the factorization output format used in SSYTRF that is stored
    !> on exit in parameter A. It also converts in place details of
    !> the interchanges stored in IPIV from the format used in SSYTRF_RK
    !> (or SSYTRF_BK) into the format used in SSYTRF.
    !>

Parameters
    UPLO

    !>          UPLO is CHARACTER*1
    !>          Specifies whether the details of the factorization are
    !>          stored as an upper or lower triangular matrix A.
    !>          = 'U':  Upper triangular
    !>          = 'L':  Lower triangular
    !>

    WAY

    !>          WAY is CHARACTER*1
    !>          = 'C': Convert
    !>          = 'R': Revert
    !>

    N

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

    A

    !>          A is REAL array, dimension (LDA,N)
    !>
    !>          1) If WAY ='C':
    !>
    !>          On entry, contains factorization details in format used in
    !>          SSYTRF:
    !>            a) all elements of the symmetric block diagonal
    !>               matrix D on the diagonal of A and on superdiagonal
    !>               (or subdiagonal) of A, and
    !>            b) If UPLO = 'U': multipliers used to obtain factor U
    !>               in the superdiagonal part of A.
    !>               If UPLO = 'L': multipliers used to obtain factor L
    !>               in the superdiagonal part of A.
    !>
    !>          On exit, contains factorization details in format used in
    !>          SSYTRF_RK or SSYTRF_BK:
    !>            a) ONLY diagonal elements of the symmetric block diagonal
    !>               matrix D on the diagonal of A, i.e. D(k,k) = A(k,k);
    !>               (superdiagonal (or subdiagonal) elements of D
    !>                are stored on exit in array E), and
    !>            b) If UPLO = 'U': factor U in the superdiagonal part of A.
    !>               If UPLO = 'L': factor L in the subdiagonal part of A.
    !>
    !>          2) If WAY = 'R':
    !>
    !>          On entry, contains factorization details in format used in
    !>          SSYTRF_RK or SSYTRF_BK:
    !>            a) ONLY diagonal elements of the symmetric block diagonal
    !>               matrix D on the diagonal of A, i.e. D(k,k) = A(k,k);
    !>               (superdiagonal (or subdiagonal) elements of D
    !>                are stored on exit in array E), and
    !>            b) If UPLO = 'U': factor U in the superdiagonal part of A.
    !>               If UPLO = 'L': factor L in the subdiagonal part of A.
    !>
    !>          On exit, contains factorization details in format used in
    !>          SSYTRF:
    !>            a) all elements of the symmetric block diagonal
    !>               matrix D on the diagonal of A and on superdiagonal
    !>               (or subdiagonal) of A, and
    !>            b) If UPLO = 'U': multipliers used to obtain factor U
    !>               in the superdiagonal part of A.
    !>               If UPLO = 'L': multipliers used to obtain factor L
    !>               in the superdiagonal part of A.
    !>

    LDA

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

    E

    !>          E is REAL array, dimension (N)
    !>
    !>          1) If WAY ='C':
    !>
    !>          On entry, just a workspace.
    !>
    !>          On exit, contains the superdiagonal (or subdiagonal)
    !>          elements of the symmetric block diagonal matrix D
    !>          with 1-by-1 or 2-by-2 diagonal blocks, where
    !>          If UPLO = 'U': E(i) = D(i-1,i), i=2:N, E(1) is set to 0;
    !>          If UPLO = 'L': E(i) = D(i+1,i), i=1:N-1, E(N) is set to 0.
    !>
    !>          2) If WAY = 'R':
    !>
    !>          On entry, contains the superdiagonal (or subdiagonal)
    !>          elements of the symmetric block diagonal matrix D
    !>          with 1-by-1 or 2-by-2 diagonal blocks, where
    !>          If UPLO = 'U': E(i) = D(i-1,i),i=2:N, E(1) not referenced;
    !>          If UPLO = 'L': E(i) = D(i+1,i),i=1:N-1, E(N) not referenced.
    !>
    !>          On exit, is not changed
    !>

    IPIV

    !>          IPIV is INTEGER array, dimension (N)
    !>
    !>          1) If WAY ='C':
    !>          On entry, details of the interchanges and the block
    !>          structure of D in the format used in SSYTRF.
    !>          On exit, details of the interchanges and the block
    !>          structure of D in the format used in SSYTRF_RK
    !>          ( or SSYTRF_BK).
    !>
    !>          1) If WAY ='R':
    !>          On entry, details of the interchanges and the block
    !>          structure of D in the format used in SSYTRF_RK
    !>          ( or SSYTRF_BK).
    !>          On exit, details of the interchanges and the block
    !>          structure of D in the format used in SSYTRF.
    !>

    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.

Contributors:

    !>
    !>  November 2017,  Igor Kozachenko,
    !>                  Computer Science Division,
    !>                  University of California, Berkeley
    !>
    !>

Definition at line 205 of file ssyconvf.f.

  subroutine zsyconvf (character uplo, character way, integer n, complex*16, dimension( lda, * ) a, integer lda, complex*16, dimension( * ) e, integer, dimension( * ) ipiv, integer info)

ZSYCONVF

Purpose:

    !> If parameter WAY = 'C':
    !> ZSYCONVF converts the factorization output format used in
    !> ZSYTRF provided on entry in parameter A into the factorization
    !> output format used in ZSYTRF_RK (or ZSYTRF_BK) that is stored
    !> on exit in parameters A and E. It also converts in place details of
    !> the interchanges stored in IPIV from the format used in ZSYTRF into
    !> the format used in ZSYTRF_RK (or ZSYTRF_BK).
    !>
    !> If parameter WAY = 'R':
    !> ZSYCONVF performs the conversion in reverse direction, i.e.
    !> converts the factorization output format used in ZSYTRF_RK
    !> (or ZSYTRF_BK) provided on entry in parameters A and E into
    !> the factorization output format used in ZSYTRF that is stored
    !> on exit in parameter A. It also converts in place details of
    !> the interchanges stored in IPIV from the format used in ZSYTRF_RK
    !> (or ZSYTRF_BK) into the format used in ZSYTRF.
    !>
    !> ZSYCONVF can also convert in Hermitian matrix case, i.e. between
    !> formats used in ZHETRF and ZHETRF_RK (or ZHETRF_BK).
    !>

Parameters
    UPLO

    !>          UPLO is CHARACTER*1
    !>          Specifies whether the details of the factorization are
    !>          stored as an upper or lower triangular matrix A.
    !>          = 'U':  Upper triangular
    !>          = 'L':  Lower triangular
    !>

    WAY

    !>          WAY is CHARACTER*1
    !>          = 'C': Convert
    !>          = 'R': Revert
    !>

    N

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

    A

    !>          A is COMPLEX*16 array, dimension (LDA,N)
    !>
    !>          1) If WAY ='C':
    !>
    !>          On entry, contains factorization details in format used in
    !>          ZSYTRF:
    !>            a) all elements of the symmetric block diagonal
    !>               matrix D on the diagonal of A and on superdiagonal
    !>               (or subdiagonal) of A, and
    !>            b) If UPLO = 'U': multipliers used to obtain factor U
    !>               in the superdiagonal part of A.
    !>               If UPLO = 'L': multipliers used to obtain factor L
    !>               in the superdiagonal part of A.
    !>
    !>          On exit, contains factorization details in format used in
    !>          ZSYTRF_RK or ZSYTRF_BK:
    !>            a) ONLY diagonal elements of the symmetric block diagonal
    !>               matrix D on the diagonal of A, i.e. D(k,k) = A(k,k);
    !>               (superdiagonal (or subdiagonal) elements of D
    !>                are stored on exit in array E), and
    !>            b) If UPLO = 'U': factor U in the superdiagonal part of A.
    !>               If UPLO = 'L': factor L in the subdiagonal part of A.
    !>
    !>          2) If WAY = 'R':
    !>
    !>          On entry, contains factorization details in format used in
    !>          ZSYTRF_RK or ZSYTRF_BK:
    !>            a) ONLY diagonal elements of the symmetric block diagonal
    !>               matrix D on the diagonal of A, i.e. D(k,k) = A(k,k);
    !>               (superdiagonal (or subdiagonal) elements of D
    !>                are stored on exit in array E), and
    !>            b) If UPLO = 'U': factor U in the superdiagonal part of A.
    !>               If UPLO = 'L': factor L in the subdiagonal part of A.
    !>
    !>          On exit, contains factorization details in format used in
    !>          ZSYTRF:
    !>            a) all elements of the symmetric block diagonal
    !>               matrix D on the diagonal of A and on superdiagonal
    !>               (or subdiagonal) of A, and
    !>            b) If UPLO = 'U': multipliers used to obtain factor U
    !>               in the superdiagonal part of A.
    !>               If UPLO = 'L': multipliers used to obtain factor L
    !>               in the superdiagonal part of A.
    !>

    LDA

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

    E

    !>          E is COMPLEX*16 array, dimension (N)
    !>
    !>          1) If WAY ='C':
    !>
    !>          On entry, just a workspace.
    !>
    !>          On exit, contains the superdiagonal (or subdiagonal)
    !>          elements of the symmetric block diagonal matrix D
    !>          with 1-by-1 or 2-by-2 diagonal blocks, where
    !>          If UPLO = 'U': E(i) = D(i-1,i), i=2:N, E(1) is set to 0;
    !>          If UPLO = 'L': E(i) = D(i+1,i), i=1:N-1, E(N) is set to 0.
    !>
    !>          2) If WAY = 'R':
    !>
    !>          On entry, contains the superdiagonal (or subdiagonal)
    !>          elements of the symmetric block diagonal matrix D
    !>          with 1-by-1 or 2-by-2 diagonal blocks, where
    !>          If UPLO = 'U': E(i) = D(i-1,i),i=2:N, E(1) not referenced;
    !>          If UPLO = 'L': E(i) = D(i+1,i),i=1:N-1, E(N) not referenced.
    !>
    !>          On exit, is not changed
    !>

    IPIV

    !>          IPIV is INTEGER array, dimension (N)
    !>
    !>          1) If WAY ='C':
    !>          On entry, details of the interchanges and the block
    !>          structure of D in the format used in ZSYTRF.
    !>          On exit, details of the interchanges and the block
    !>          structure of D in the format used in ZSYTRF_RK
    !>          ( or ZSYTRF_BK).
    !>
    !>          1) If WAY ='R':
    !>          On entry, details of the interchanges and the block
    !>          structure of D in the format used in ZSYTRF_RK
    !>          ( or ZSYTRF_BK).
    !>          On exit, details of the interchanges and the block
    !>          structure of D in the format used in ZSYTRF.
    !>

    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.

Contributors:

    !>
    !>  November 2017,  Igor Kozachenko,
    !>                  Computer Science Division,
    !>                  University of California, Berkeley
    !>
    !>

Definition at line 208 of file zsyconvf.f.

Author

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