dbdt02.f - Man Page

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.

Referenced By

The man page dbdt02(3) is an alias of dbdt02.f(3).

Tue Nov 28 2023 12:08:42 Version 3.12.0 LAPACK