TESTING/LIN/spot01.f(3)    Library Functions Manual    TESTING/LIN/spot01.f(3)

NAME
       TESTING/LIN/spot01.f

SYNOPSIS
   Functions/Subroutines
       subroutine spot01 (uplo, n, a, lda, afac, ldafac, rwork, resid)
           SPOT01

Function/Subroutine Documentation
   subroutine spot01 (character uplo, integer n, real, dimension( lda, * ) a,
       integer lda, real, dimension( ldafac, * ) afac, integer ldafac, real,
       dimension( * ) rwork, real resid)
       SPOT01

       Purpose:


           !>
           !> SPOT01 reconstructs a symmetric positive definite matrix  A  from
           !> its L*L' or U'*U factorization and computes the residual
           !>    norm( L*L' - A ) / ( N * norm(A) * EPS ) or
           !>    norm( U'*U - A ) / ( N * norm(A) * EPS ),
           !> where EPS is the machine epsilon.
           !>

       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.
           !>

           A

           !>          A is REAL array, dimension (LDA,N)
           !>          The original symmetric matrix A.
           !>

           LDA

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

           AFAC

           !>          AFAC is REAL array, dimension (LDAFAC,N)
           !>          On entry, the factor L or U from the L * L**T or U**T * U
           !>          factorization of A.
           !>          Overwritten with the reconstructed matrix, and then with
           !>          the difference L * L**T - A (or U**T * U - A).
           !>

           LDAFAC

           !>          LDAFAC is INTEGER
           !>          The leading dimension of the array AFAC.  LDAFAC >= max(1,N).
           !>

           RWORK

           !>          RWORK is REAL array, dimension (N)
           !>

           RESID

           !>          RESID is REAL
           !>          If UPLO = 'L', norm(L * L**T - A) / ( N * norm(A) * EPS )
           !>          If UPLO = 'U', norm(U**T * U - A) / ( N * norm(A) * EPS )
           !>

       Author
           Univ. of Tennessee


           Univ. of California Berkeley


           Univ. of Colorado Denver


           NAG Ltd.

       Definition at line 103 of file spot01.f.

Author
       Generated automatically by Doxygen for LAPACK from the source code.

LAPACK                          Version 3.12.0         TESTING/LIN/spot01.f(3)