# zlatzm (l) - Linux Manuals

## NAME

ZLATZM - routine i deprecated and has been replaced by routine ZUNMRZ

## SYNOPSIS

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

CHARACTER SIDE

INTEGER INCV, LDC, M, N

COMPLEX*16 TAU

COMPLEX*16 C1( LDC, * ), C2( LDC, * ), V( * ), WORK( * )

## 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This routine is deprecated and has been replaced by routine ZUNMRZ.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*uaq, u = ( 1 ),

)
where v is an (m-1) vector if SIDE = aqLaq, or a (n-1) vector if SIDE = aqRaq.
If SIDE equals aqLaq, let

C1 1

C2 m-1

n
Then C is overwritten by P*C.
If SIDE equals aqRaq, let

C1, C2 m

n-1
Then C is overwritten by C*P.

## ARGUMENTS

SIDE (input) CHARACTER*1
= aqLaq: form P * C
= aqRaq: form C * P
M (input) INTEGER
The number of rows of the matrix C.
N (input) INTEGER
The number of columns of the matrix C.
V (input) COMPLEX*16 array, dimension
(1 + (M-1)*abs(INCV)) if SIDE = aqLaq (1 + (N-1)*abs(INCV)) if SIDE = aqRaq The vector v in the representation of P. V is not used if TAU = 0.
INCV (input) INTEGER
The increment between elements of v. INCV <> 0
TAU (input) COMPLEX*16
The value tau in the representation of P.
C1 (input/output) COMPLEX*16 array, dimension
(LDC,N) if SIDE = aqLaq (M,1) if SIDE = aqRaq On entry, the n-vector C1 if SIDE = aqLaq, or the m-vector C1 if SIDE = aqRaq. On exit, the first row of P*C if SIDE = aqLaq, or the first column of C*P if SIDE = aqRaq.
C2 (input/output) COMPLEX*16 array, dimension
(LDC, N) if SIDE = aqLaq (LDC, N-1) if SIDE = aqRaq On entry, the (m - 1) x n matrix C2 if SIDE = aqLaq, or the m x (n - 1) matrix C2 if SIDE = aqRaq. On exit, rows 2:m of P*C if SIDE = aqLaq, or columns 2:m of C*P if SIDE = aqRaq.
LDC (input) INTEGER
The leading dimension of the arrays C1 and C2. LDC >= max(1,M).
WORK (workspace) COMPLEX*16 array, dimension
(N) if SIDE = aqLaq (M) if SIDE = aqRaq