dgetrs.f(3)

NAME
dgetrs.f -

SYNOPSIS

  Functions/Subroutines
subroutine DGETRS (TRANS, N, NRHS, A, LDA, IPIV, B, LDB, INFO)
DGETRS

Function/Subroutine Documentation

  subroutine DGETRS (CHARACTERTRANS, INTEGERN, INTEGERNRHS, DOUBLE PRECISION, dimension( lda, * )A, INTEGERLDA, INTEGER, dimension( * )IPIV, DOUBLE PRECISION, dimension( ldb, * )B, INTEGERLDB, INTEGERINFO)

DGETRS

Purpose:

     DGETRS solves a system of linear equations
        A * X = B  or  A**T * X = B
     with a general N-by-N matrix A using the LU factorization computed
     by DGETRF.

Parameters:
    TRANS

              TRANS is CHARACTER*1
              Specifies the form of the system of equations:
              = 'N':  A * X = B  (No transpose)
              = 'T':  A**T* X = B  (Transpose)
              = 'C':  A**T* X = B  (Conjugate transpose = Transpose)

    N

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

    NRHS

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

    A

              A is DOUBLE PRECISION array, dimension (LDA,N)
              The factors L and U from the factorization A = P*L*U
              as computed by DGETRF.

    LDA

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

    IPIV

              IPIV is INTEGER array, dimension (N)
              The pivot indices from DGETRF; for 1<=i<=N, row i of the
              matrix was interchanged with row IPIV(i).

    B

              B is DOUBLE PRECISION array, dimension (LDB,NRHS)
              On entry, the right hand side matrix B.
              On exit, the solution matrix X.

    LDB

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

    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'.

Date:
    November 2011

Definition at line 122 of file dgetrs.f'.

Author

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