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slarfp.3lapack
Langue: en
Version: 282847 (debian - 07/07/09)
Section: 3 (Bibliothèques de fonctions)
NAME
SLARFP - generates a real elementary reflector H of order n, such that H * ( alpha ) = ( beta ), H' * H = ISYNOPSIS
- SUBROUTINE SLARFP(
- N, ALPHA, X, INCX, TAU )
- INTEGER INCX, N
- REAL ALPHA, TAU
- REAL X( * )
PURPOSE
SLARFP generates a real elementary reflector H of order n, such that( x ) ( 0 )
where alpha and beta are scalars, beta is non-negative, and x is an (n-1)-element real vector. H is represented in the form
H = I - tau * ( 1 ) * ( 1 v' ) ,
( v )
where tau is a real scalar and v is a real (n-1)-element
vector.
If the elements of x are all zero, then tau = 0 and H is taken to be the unit matrix.
Otherwise 1 <= tau <= 2.
ARGUMENTS
- N (input) INTEGER
- The order of the elementary reflector.
- ALPHA (input/output) REAL
- On entry, the value alpha. On exit, it is overwritten with the value beta.
- X (input/output) REAL array, dimension
- (1+(N-2)*abs(INCX)) On entry, the vector x. On exit, it is overwritten with the vector v.
- INCX (input) INTEGER
- The increment between elements of X. INCX > 0.
- TAU (output) REAL
- The value tau.
Contenus ©2006-2024 Benjamin Poulain
Design ©2006-2024 Maxime Vantorre