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## csptrs()

subroutine csptrs | ( | character | uplo,
|  | integer | n,
|  | integer | nrhs,
|  | complex, dimension( * ) | ap,
|  | integer, dimension( * ) | ipiv,
|  | complex, dimension( ldb, * ) | b,
|  | integer | ldb,
|  | integer | info )

CSPTRS

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

Purpose:

      !>
      !> CSPTRS solves a system of linear equations A*X = B with a complex
      !> symmetric matrix A stored in packed format using the factorization
      !> A = U*D*U**T or A = L*D*L**T computed by CSPTRF.
      !>

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

  [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]

  AP

      !>          AP is COMPLEX array, dimension (N*(N+1)/2)
      !>          The block diagonal matrix D and the multipliers used to
      !>          obtain the factor U or L as computed by CSPTRF, stored as a
      !>          packed triangular matrix.
      !>

  [in]

  IPIV

      !>          IPIV is INTEGER array, dimension (N)
      !>          Details of the interchanges and the block structure of D
      !>          as determined by CSPTRF.
      !>

  [in,out]

  B

      !>          B is COMPLEX 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]

  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.