# zbdt02.f - Man Page

TESTING/EIG/zbdt02.f

## Synopsis

### Functions/Subroutines

subroutine zbdt02 (m, n, b, ldb, c, ldc, u, ldu, work, rwork, resid)
ZBDT02

## Function/Subroutine Documentation

### subroutine zbdt02 (integer m, integer n, complex*16, dimension( ldb, * ) b, integer ldb, complex*16, dimension( ldc, * ) c, integer ldc, complex*16, dimension( ldu, * ) u, integer ldu, complex*16, dimension( * ) work, double precision, dimension( * ) rwork, double precision resid)

ZBDT02

Purpose:

ZBDT02 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 COMPLEX*16 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 COMPLEX*16 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 COMPLEX*16 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 COMPLEX*16 array, dimension (M)

RWORK

RWORK 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

NAG Ltd.

Definition at line 118 of file zbdt02.f.

## Author

Generated automatically by Doxygen for LAPACK from the source code.

## Referenced By

The man page zbdt02(3) is an alias of zbdt02.f(3).

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