DLATZM (3) Linux Manual Page

dlatzm.f –

Synopsis

Functions/Subroutines

subroutine dlatzm (SIDE, M, N, V, INCV, TAU, C1, C2, LDC, WORK)
DLATZM

Function/Subroutine Documentation

subroutine dlatzm (characterSIDE, integerM, integerN, double precision, dimension( * )V, integerINCV, double precisionTAU, double precision, dimension( ldc, * )C1, double precision, dimension( ldc, * )C2, integerLDC, double precision, dimension( * )WORK)

DLATZM

Purpose:

 This routine is deprecated and has been replaced by routine DORMRZ.

 DLATZM applies a Householder matrix generated by DTZRQF 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 DOUBLE PRECISION 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 DOUBLE PRECISION

 The value tau in the representation of P.

C1

 C1 is DOUBLE PRECISION 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 DOUBLE PRECISION 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 DOUBLE PRECISION 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 dlatzm.f.

Author

Generated automatically by Doxygen for LAPACK from the source code.