TESTING/LIN/dtrt06.f(3)    Library Functions Manual    TESTING/LIN/dtrt06.f(3)

NAME
       TESTING/LIN/dtrt06.f

SYNOPSIS
   Functions/Subroutines
       subroutine dtrt06 (rcond, rcondc, uplo, diag, n, a, lda, work, rat)
           DTRT06

Function/Subroutine Documentation
   subroutine dtrt06 (double precision rcond, double precision rcondc,
       character uplo, character diag, integer n, double precision, dimension(
       lda, * ) a, integer lda, double precision, dimension( * ) work, double
       precision rat)
       DTRT06

       Purpose:


           !>
           !> DTRT06 computes a test ratio comparing RCOND (the reciprocal
           !> condition number of a triangular matrix A) and RCONDC, the estimate
           !> computed by DTRCON.  Information about the triangular matrix A is
           !> used if one estimate is zero and the other is non-zero to decide if
           !> underflow in the estimate is justified.
           !>

       Parameters
           RCOND

           !>          RCOND is DOUBLE PRECISION
           !>          The estimate of the reciprocal condition number obtained by
           !>          forming the explicit inverse of the matrix A and computing
           !>          RCOND = 1/( norm(A) * norm(inv(A)) ).
           !>

           RCONDC

           !>          RCONDC is DOUBLE PRECISION
           !>          The estimate of the reciprocal condition number computed by
           !>          DTRCON.
           !>

           UPLO

           !>          UPLO is CHARACTER
           !>          Specifies whether the matrix A is upper or lower triangular.
           !>          = 'U':  Upper triangular
           !>          = 'L':  Lower triangular
           !>

           DIAG

           !>          DIAG is CHARACTER
           !>          Specifies whether or not the matrix A is unit triangular.
           !>          = 'N':  Non-unit triangular
           !>          = 'U':  Unit triangular
           !>

           N

           !>          N is INTEGER
           !>          The order of the matrix A.  N >= 0.
           !>

           A

           !>          A is DOUBLE PRECISION array, dimension (LDA,N)
           !>          The triangular matrix A.  If UPLO = 'U', the leading n by n
           !>          upper triangular part of the array A contains the upper
           !>          triangular matrix, and the strictly lower triangular part of
           !>          A is not referenced.  If UPLO = 'L', the leading n by n lower
           !>          triangular part of the array A contains the lower triangular
           !>          matrix, and the strictly upper triangular part of A is not
           !>          referenced.  If DIAG = 'U', the diagonal elements of A are
           !>          also not referenced and are assumed to be 1.
           !>

           LDA

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

           WORK

           !>          WORK is DOUBLE PRECISION array, dimension (N)
           !>

           RAT

           !>          RAT is DOUBLE PRECISION
           !>          The test ratio.  If both RCOND and RCONDC are nonzero,
           !>             RAT = MAX( RCOND, RCONDC )/MIN( RCOND, RCONDC ) - 1.
           !>          If RAT = 0, the two estimates are exactly the same.
           !>

       Author
           Univ. of Tennessee


           Univ. of California Berkeley


           Univ. of Colorado Denver


           NAG Ltd.

       Definition at line 119 of file dtrt06.f.

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

LAPACK                          Version 3.12.0         TESTING/LIN/dtrt06.f(3)