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## zhetrs_aa()

subroutine zhetrs_aa | ( | character | uplo,
|  | integer | n,
|  | integer | nrhs,
|  | complex*16, dimension( lda, * ) | a,
|  | integer | lda,
|  | integer, dimension( * ) | ipiv,
|  | complex*16, dimension( ldb, * ) | b,
|  | integer | ldb,
|  | complex*16, dimension( * ) | work,
|  | integer | lwork,
|  | integer | info )

ZHETRS_AA

Download ZHETRS_AA + dependencies [TGZ] [ZIP] [TXT]

Purpose:

      !>
      !> ZHETRS_AA solves a system of linear equations A*X = B with a complex
      !> hermitian matrix A using the factorization A = U**H*T*U or
      !> A = L*T*L**H computed by ZHETRF_AA.
      !>

Parameters

  [in]

  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**H*T*U;
      !>          = 'L':  Lower triangular, form is A = L*T*L**H.
      !>

  [in]

  N

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

  [in]

  NRHS

      !>          NRHS is INTEGER
      !>          The number of right hand sides, i.e., the number of columns
      !>          of the matrix B.  NRHS >= 0.
      !>

  [in]

  A

      !>          A is COMPLEX*16 array, dimension (LDA,N)
      !>          Details of factors computed by ZHETRF_AA.
      !>

  [in]

  LDA

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

  [in]

  IPIV

      !>          IPIV is INTEGER array, dimension (N)
      !>          Details of the interchanges as computed by ZHETRF_AA.
      !>

  [in,out]

  B

      !>          B is COMPLEX*16 array, dimension (LDB,NRHS)
      !>          On entry, the right hand side matrix B.
      !>          On exit, the solution matrix X.
      !>

  [in]

  LDB

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

  [out]

  WORK

      !>          WORK is COMPLEX*16 array, dimension (MAX(1,LWORK))
      !>

  [in]

  LWORK

      !>          LWORK is INTEGER
      !>          The dimension of the array WORK.
      !>          If MIN(N,NRHS) = 0, LWORK >= 1, else LWORK >= 3*N-2.
      !>
      !>          If LWORK = -1, then a workspace query is assumed; the routine
      !>          only calculates the minimal size of the WORK array, returns
      !>          this value as the first entry of the WORK array, and no error
      !>          message related to LWORK is issued by XERBLA.
      !>

  [out]

  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.