TESTING/EIG/sbdt02.f(3)

NAME
TESTING/EIG/sbdt02.f

SYNOPSIS

  Functions/Subroutines
subroutine sbdt02 (m, n, b, ldb, c, ldc, u, ldu, work, resid)
SBDT02

Function/Subroutine Documentation

  subroutine sbdt02 (integer m, integer n, real, dimension( ldb, * ) b, integer ldb, real, dimension( ldc, * ) c, integer ldc, real, dimension( ldu, * ) u, integer ldu, real, dimension( * ) work, real resid)

SBDT02

Purpose:

    !>
    !> SBDT02 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 REAL 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 REAL 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 REAL 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 REAL array, dimension (M)
    !>

    RESID

    !>          RESID is REAL
    !>          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 sbdt02.f.

Author

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