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/home/abuild/rpmbuild/BUILD/lapack-3.12.0/TESTING/EIG/dbdt02.f(3) Library Functions Manual /home/abuild/rpmbuild/BUILD/lapack-3.12.0/TESTING/EIG/dbdt02.f(3)

NAME

/home/abuild/rpmbuild/BUILD/lapack-3.12.0/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

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Version 3.12.0 LAPACK