slatzm.f man page

slatzm.f —

Synopsis

Functions/Subroutines

subroutine slatzm (SIDE, M, N, V, INCV, TAU, C1, C2, LDC, WORK)
SLATZM

Function/Subroutine Documentation

subroutine slatzm (characterSIDE, integerM, integerN, real, dimension( * )V, integerINCV, realTAU, real, dimension( ldc, * )C1, real, dimension( ldc, * )C2, integerLDC, real, dimension( * )WORK)

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This routine is deprecated and has been replaced by routine SORMRZ.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

Date:

November 2011

Definition at line 152 of file slatzm.f.

Author

Generated automatically by Doxygen for LAPACK from the source code.

Referenced By

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

Sat Nov 16 2013 Version 3.4.2 LAPACK