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.