dlatzm (3) - Linux Manuals
NAME
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This routine is deprecated and has been replaced by routine DORMRZ.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
MM is INTEGER The number of rows of the matrix C.
NN is INTEGER The number of columns of the matrix C.
VV 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.
INCVINCV is INTEGER The increment between elements of v. INCV <> 0
TAUTAU is DOUBLE PRECISION The value tau in the representation of P.
C1C1 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'.
C2C2 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'.
LDCLDC is INTEGER The leading dimension of the arrays C1 and C2. LDC >= (1,M).
WORKWORK 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
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