TESTING/LIN/dpot01.f(3)    Library Functions Manual    TESTING/LIN/dpot01.f(3)

NAME
       TESTING/LIN/dpot01.f

SYNOPSIS
   Functions/Subroutines
       subroutine dpot01 (uplo, n, a, lda, afac, ldafac, rwork, resid)
           DPOT01

Function/Subroutine Documentation
   subroutine dpot01 (character uplo, integer n, double precision, dimension(
       lda, * ) a, integer lda, double precision, dimension( ldafac, * ) afac,
       integer ldafac, double precision, dimension( * ) rwork, double
       precision resid)
       DPOT01

       Purpose:


           !>
           !> DPOT01 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 DOUBLE PRECISION 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 DOUBLE PRECISION 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 DOUBLE PRECISION array, dimension (N)
           !>

           RESID

           !>          RESID is DOUBLE PRECISION
           !>          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 dpot01.f.

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

LAPACK                          Version 3.12.0         TESTING/LIN/dpot01.f(3)