TESTING/LIN/strt01.f(3)    Library Functions Manual    TESTING/LIN/strt01.f(3)

NAME
       TESTING/LIN/strt01.f

SYNOPSIS
   Functions/Subroutines
       subroutine strt01 (uplo, diag, n, a, lda, ainv, ldainv, rcond, work,
           resid)
           STRT01

Function/Subroutine Documentation
   subroutine strt01 (character uplo, character diag, integer n, real,
       dimension( lda, * ) a, integer lda, real, dimension( ldainv, * ) ainv,
       integer ldainv, real rcond, real, dimension( * ) work, real resid)
       STRT01

       Purpose:


           !>
           !> STRT01 computes the residual for a triangular matrix A times its
           !> inverse:
           !>    RESID = norm( A*AINV - I ) / ( N * norm(A) * norm(AINV) * EPS ),
           !> where EPS is the machine epsilon.
           !>

       Parameters
           UPLO

           !>          UPLO is CHARACTER*1
           !>          Specifies whether the matrix A is upper or lower triangular.
           !>          = 'U':  Upper triangular
           !>          = 'L':  Lower triangular
           !>

           DIAG

           !>          DIAG is CHARACTER*1
           !>          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 REAL 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).
           !>

           AINV

           !>          AINV is REAL array, dimension (LDAINV,N)
           !>          On entry, the (triangular) inverse of the matrix A, in the
           !>          same storage format as A.
           !>          On exit, the contents of AINV are destroyed.
           !>

           LDAINV

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

           RCOND

           !>          RCOND is REAL
           !>          The reciprocal condition number of A, computed as
           !>          1/(norm(A) * norm(AINV)).
           !>

           WORK

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

           RESID

           !>          RESID is REAL
           !>          norm(A*AINV - I) / ( N * norm(A) * norm(AINV) * EPS )
           !>

       Author
           Univ. of Tennessee


           Univ. of California Berkeley


           Univ. of Colorado Denver


           NAG Ltd.

       Definition at line 122 of file strt01.f.

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

LAPACK                          Version 3.12.0         TESTING/LIN/strt01.f(3)