TESTING/LIN/sppt02.f(3)

NAME
TESTING/LIN/sppt02.f

SYNOPSIS

  Functions/Subroutines
subroutine sppt02 (uplo, n, nrhs, a, x, ldx, b, ldb, rwork, resid)
SPPT02

Function/Subroutine Documentation

  subroutine sppt02 (character uplo, integer n, integer nrhs, real, dimension( * ) a, real, dimension( ldx, * ) x, integer ldx, real, dimension( ldb, * ) b, integer ldb, real, dimension( * ) rwork, real resid)

SPPT02

Purpose:

     SPPT02 computes the residual in the solution of a symmetric system
     of linear equations  A*x = b  when packed storage is used for the
     coefficient matrix.  The ratio computed is
        RESID = norm(B - A*X) / ( norm(A) * norm(X) * EPS),
     where EPS is the machine precision.

Parameters
    UPLO

              UPLO is CHARACTER*1
              Specifies whether the upper or lower triangular part of the
              symmetric matrix A is stored:
              = 'U':  Upper triangular
              = 'L':  Lower triangular

    N

              N is INTEGER
              The number of rows and columns of the matrix A.  N >= 0.

    NRHS

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

    A

              A is REAL array, dimension (N*(N+1)/2)
              The original symmetric matrix A, stored as a packed
              triangular matrix.

    X

              X is REAL array, dimension (LDX,NRHS)
              The computed solution vectors for the system of linear
              equations.

    LDX

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

    B

              B is REAL array, dimension (LDB,NRHS)
              On entry, the right hand side vectors for the system of
              linear equations.
              On exit, B is overwritten with the difference B - A*X.

    LDB

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

    RWORK

              RWORK is REAL array, dimension (N)

    RESID

              RESID is REAL
              The maximum over the number of right hand sides of
              norm(B - A*X) / ( norm(A) * norm(X) * EPS ).

Author
    Univ. of Tennessee

    Univ. of California Berkeley

    Univ. of Colorado Denver

    NAG Ltd.

Definition at line 120 of file sppt02.f.

Author

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