TESTING/EIG/dbdt02.f(3)

NAME
TESTING/EIG/dbdt02.f

SYNOPSIS

  Functions/Subroutines
subroutine dbdt02 (m, n, b, ldb, c, ldc, u, ldu, work, resid)
DBDT02

Function/Subroutine Documentation

  subroutine dbdt02 (integer m, integer n, double precision, dimension( ldb, * ) b, integer ldb, double precision, dimension( ldc, * ) c, integer ldc, double precision, dimension( ldu, * ) u, integer ldu, double precision, dimension( * ) work, double precision resid)

DBDT02

Purpose:

    !>
    !> DBDT02 tests the change of basis C = U**H * B by computing the
    !> residual
    !>
    !>    RESID = norm(B - U * C) / ( max(m,n) * norm(B) * EPS ),
    !>
    !> where B and C are M by N matrices, U is an M by M orthogonal matrix,
    !> and EPS is the machine precision.
    !>

Parameters
    M

    !>          M is INTEGER
    !>          The number of rows of the matrices B and C and the order of
    !>          the matrix Q.
    !>

    N

    !>          N is INTEGER
    !>          The number of columns of the matrices B and C.
    !>

    B

    !>          B is DOUBLE PRECISION array, dimension (LDB,N)
    !>          The m by n matrix B.
    !>

    LDB

    !>          LDB is INTEGER
    !>          The leading dimension of the array B.  LDB >= max(1,M).
    !>

    C

    !>          C is DOUBLE PRECISION array, dimension (LDC,N)
    !>          The m by n matrix C, assumed to contain U**H * B.
    !>

    LDC

    !>          LDC is INTEGER
    !>          The leading dimension of the array C.  LDC >= max(1,M).
    !>

    U

    !>          U is DOUBLE PRECISION array, dimension (LDU,M)
    !>          The m by m orthogonal matrix U.
    !>

    LDU

    !>          LDU is INTEGER
    !>          The leading dimension of the array U.  LDU >= max(1,M).
    !>

    WORK

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

    RESID

    !>          RESID is DOUBLE PRECISION
    !>          RESID = norm(B - U * C) / ( max(m,n) * norm(B) * EPS ),
    !>

Author
    Univ. of Tennessee

    Univ. of California Berkeley

    Univ. of Colorado Denver

    NAG Ltd.

Definition at line 111 of file dbdt02.f.

Author

Generated automatically by Doxygen for LAPACK from the source code.