TESTING/LIN/sppt02.f(3)    Library Functions Manual    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
       Generated automatically by Doxygen for LAPACK from the source code.

LAPACK                          Version 3.12.0         TESTING/LIN/sppt02.f(3)