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dlatzm.f(3) | LAPACK | dlatzm.f(3) |
NAME¶
dlatzm.f -SYNOPSIS¶
Functions/Subroutines¶
subroutine dlatzm (SIDE, M, N, V, INCV, TAU, C1, C2, LDC, WORK)
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DLATZM Purpose:This routine is deprecated and has been replaced by routine DORMRZ.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.
SIDE
Author:
SIDE is CHARACTER*1 = 'L': form P * C = 'R': form C * PM
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 <> 0TAU
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'
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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