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SRC/DEPRECATED/slatzm.f(3) LAPACK SRC/DEPRECATED/slatzm.f(3)

SRC/DEPRECATED/slatzm.f


subroutine slatzm (side, m, n, v, incv, tau, c1, c2, ldc, work)
SLATZM

SLATZM

Purpose:


This routine is deprecated and has been replaced by routine SORMRZ.
SLATZM applies a Householder matrix generated by STZRQF to a matrix.
Let P = I - tau*u*u**T, 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 REAL 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 REAL
The value tau in the representation of P.

C1


C1 is REAL 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 REAL 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 >= (1,M).

WORK


WORK is REAL array, dimension
(N) if SIDE = 'L'
(M) if SIDE = 'R'

Author

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Definition at line 150 of file slatzm.f.

Generated automatically by Doxygen for LAPACK from the source code.

Sun Jan 12 2025 15:13:30 Version 3.12.1

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