zlatzm.f man page

zlatzm.f —

Synopsis

Functions/Subroutines

subroutine zlatzm (SIDE, M, N, V, INCV, TAU, C1, C2, LDC, WORK)
ZLATZM

Function/Subroutine Documentation

subroutine zlatzm (characterSIDE, integerM, integerN, complex*16, dimension( * )V, integerINCV, complex*16TAU, complex*16, dimension( ldc, * )C1, complex*16, dimension( ldc, * )C2, integerLDC, complex*16, dimension( * )WORK)

ZLATZM

Purpose:

This routine is deprecated and has been replaced by routine ZUNMRZ.

ZLATZM applies a Householder matrix generated by ZTZRQF to a matrix.

Let P = I - tau*u*u**H,   u = ( 1 ),
                              ( v )
where v is an (m-1) vector if SIDE = 'L', or a (n-1) vector if
SIDE = 'R'.

If SIDE equals 'L', let
       C = [ C1 ] 1
           [ C2 ] m-1
             n
Then C is overwritten by P*C.

If SIDE equals 'R', let
       C = [ C1, C2 ] m
              1  n-1
Then C is overwritten by C*P.

Parameters:

SIDE

SIDE is CHARACTER*1
= 'L': form P * C
= 'R': form C * P

M

M is INTEGER
The number of rows of the matrix C.

N

N is INTEGER
The number of columns of the matrix C.

V

V is COMPLEX*16 array, dimension
        (1 + (M-1)*abs(INCV)) if SIDE = 'L'
        (1 + (N-1)*abs(INCV)) if SIDE = 'R'
The vector v in the representation of P. V is not used
if TAU = 0.

INCV

INCV is INTEGER
The increment between elements of v. INCV <> 0

TAU

TAU is COMPLEX*16
The value tau in the representation of P.

C1

C1 is COMPLEX*16 array, dimension
               (LDC,N) if SIDE = 'L'
               (M,1)   if SIDE = 'R'
On entry, the n-vector C1 if SIDE = 'L', or the m-vector C1
if SIDE = 'R'.

On exit, the first row of P*C if SIDE = 'L', or the first
column of C*P if SIDE = 'R'.

C2

C2 is COMPLEX*16 array, dimension
               (LDC, N)   if SIDE = 'L'
               (LDC, N-1) if SIDE = 'R'
On entry, the (m - 1) x n matrix C2 if SIDE = 'L', or the
m x (n - 1) matrix C2 if SIDE = 'R'.

On exit, rows 2:m of P*C if SIDE = 'L', or columns 2:m of C*P
if SIDE = 'R'.

LDC

LDC is INTEGER
The leading dimension of the arrays C1 and C2.
LDC >= max(1,M).

WORK

WORK is COMPLEX*16 array, dimension
            (N) if SIDE = 'L'
            (M) if SIDE = 'R'

Author:

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Date:

November 2011

Definition at line 153 of file zlatzm.f.

Author

Generated automatically by Doxygen for LAPACK from the source code.

Referenced By

zlatzm(3) is an alias of zlatzm.f(3).

Sat Nov 16 2013 Version 3.4.2 LAPACK