TESTING/LIN/ztpt06.f(3)    Library Functions Manual    TESTING/LIN/ztpt06.f(3)

NAME
       TESTING/LIN/ztpt06.f

SYNOPSIS
   Functions/Subroutines
       subroutine ztpt06 (rcond, rcondc, uplo, diag, n, ap, rwork, rat)
           ZTPT06

Function/Subroutine Documentation
   subroutine ztpt06 (double precision rcond, double precision rcondc,
       character uplo, character diag, integer n, complex*16, dimension( * )
       ap, double precision, dimension( * ) rwork, double precision rat)
       ZTPT06

       Purpose:


           !>
           !> ZTPT06 computes a test ratio comparing RCOND (the reciprocal
           !> condition number of the triangular matrix A) and RCONDC, the estimate
           !> computed by ZTPCON.  Information about the triangular matrix 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
           !>          ZTPCON.
           !>

           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.
           !>

           AP

           !>          AP is COMPLEX*16 array, dimension (N*(N+1)/2)
           !>          The upper or lower triangular matrix A, packed columnwise in
           !>          a linear array.  The j-th column of A is stored in the array
           !>          AP as follows:
           !>          if UPLO = 'U', AP((j-1)*j/2 + i) = A(i,j) for 1<=i<=j;
           !>          if UPLO = 'L',
           !>             AP((j-1)*(n-j) + j*(j+1)/2 + i-j) = A(i,j) for j<=i<=n.
           !>

           RWORK

           !>          RWORK 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 111 of file ztpt06.f.

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

LAPACK                          Version 3.12.0         TESTING/LIN/ztpt06.f(3)