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clarf (3)
  • >> clarf (3) ( Solaris man: Библиотечные вызовы )
  • 
    NAME
         clarf - apply a complex elementary reflector H to a  complex
         M-by-N matrix C, from either the left or the right
    
    SYNOPSIS
         SUBROUTINE CLARF( SIDE, M, N, V, INCV, TAU, C, LDC, WORK )
    
         CHARACTER SIDE
    
         INTEGER INCV, LDC, M, N
    
         COMPLEX TAU
    
         COMPLEX C( LDC, * ), V( * ), WORK( * )
    
    
    
         #include <sunperf.h>
    
         void clarf(char side, int m, int n, complex  *v,  int  incv,
                   complex *tau, complex *cc, int ldc) ;
    
    PURPOSE
         CLARF applies a complex elementary reflector H to a  complex
         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 complex scalar and v is a complex vector.
    
         If tau = 0, then H is taken to be the unit matrix.
    
         To  apply  H'  (the  conjugate  transpose  of   H),   supply
         conjg(tau) instead tau.
    
    
    ARGUMENTS
         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) COMPLEX array, dimension
                   (1 + (M-1)*abs(INCV)) if SIDE = 'L' or  (1  +  (N-
                   1)*abs(INCV))  if  SIDE  = 'R' The vector v in the
                   representation of H. V is not used if TAU = 0.
    
         INCV      (input) INTEGER
                   The increment between elements of v. INCV <> 0.
    
         TAU       (input) COMPLEX
                   The value tau in the representation of H.
    
         C         (input/output) COMPLEX 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.  LDC  >=
                   max(1,M).
    
         WORK      (workspace) COMPLEX array, dimension
                   (N) if SIDE = 'L' or (M) if SIDE = 'R'
    
    
    
    


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