GNU/Linux man pages
Livre :
Expressions régulières,
Syntaxe et mise en oeuvre :
GNU/Linux |
CentOS 4.8 |
i386 |
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dlarfx(l) |
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DLARFX - applie a real elementary reflector H to a real m by n matrix C, from either the left or the right
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SUBROUTINE DLARFX( |
SIDE, M, N, V, TAU, C, LDC, WORK ) | ||
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CHARACTER |
SIDE | ||
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INTEGER |
LDC, M, N | ||
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DOUBLE |
PRECISION TAU | ||
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DOUBLE |
PRECISION C( LDC, * ), V( * ), WORK( * ) |
DLARFX applies a real elementary reflector H to a real m by n matrix C, from either the left or the right. H is represented in the form
H = I - tau * v * v’
where tau is a real scalar and v is a real vector.
If tau = 0, then H is taken to be the unit matrix
This version uses inline code if H has order < 11.
SIDE (input) CHARACTER*1
= ’L’: form H * C
= ’R’: form C * H
M (input) INTEGER
The number of rows of the matrix C.
N (input) INTEGER
The number of columns of the matrix C.
V (input) DOUBLE PRECISION array, dimension (M) if SIDE = ’L’
or (N) if SIDE = ’R’ The vector v in the representation of H.
TAU (input) DOUBLE PRECISION
The value tau in the representation of H.
C (input/output) DOUBLE PRECISION array, dimension (LDC,N)
On entry, the m by n matrix C. On exit, C is overwritten by the matrix H * C if SIDE = ’L’, or C * H if SIDE = ’R’.
LDC (input) INTEGER
The leading dimension of the array C. LDA >= (1,M).
WORK (workspace) DOUBLE PRECISION array, dimension
(N) if SIDE = ’L’ or (M) if SIDE = ’R’ WORK is not referenced if H has order < 11.
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dlarfx(l) | |