---
name: "zlatzm"
section: "3lapack"
platform: "linux"
package: "liblapack-doc"
version: "3.2.1-8"
release: "Debian 6.0 (Squeeze)"
platforms: ["linux"]
url: "https://new.carta.tech/zlatzm/3lapack"
---

# zlatzm(3lapack)

routine i deprecated and has been replaced by routine ZUNMRZ

## 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ZLATZM - routine i deprecated and has been replaced by routine ZUNMRZ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This routine is deprecated and has been replaced by routine ZUNMRZ.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\*u',   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.\

## ARGUMENTS

- SIDE (input) CHARACTER\*1

  \= 'L': form P \* C\
   \= 'R': 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 = '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 (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 = '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 (input/output) 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 (input) INTEGER

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

- WORK (workspace) COMPLEX\*16 array, dimension

  (N) if SIDE = 'L' (M) if SIDE = 'R'