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)