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Интерактивная система просмотра системных руководств (man-ов)

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cher (3)
  • >> cher (3) ( Solaris man: Библиотечные вызовы )
  • 
    NAME
         cher -  perform  the  hermitian  rank  1  operation    A  :=
         alpha*x*conjg( x' ) + A
    
    SYNOPSIS
         SUBROUTINE CHER ( UPLO, N, ALPHA, X, INCX, A, LDA )
    
         REAL ALPHA
    
         INTEGER INCX, LDA, N
    
         CHARACTER*1 UPLO
    
         COMPLEX A( LDA, * ), X( * )
    
    
    
         #include <sunperf.h>
    
         void cher(char uplo, int n, float alpha,  complex  *cx,  int
                   incx, complex *ca, int lda) ;
    
    PURPOSE
         CHER    performs  the  hermitian  rank  1  operation  A   :=
         alpha*x*conjg(  x'  ) + A where alpha is a real scalar, x is
         an n element vector and A is an n by n hermitian matrix.
    
    
    PARAMETERS
         UPLO      - CHARACTER*1.
                   On entry, UPLO  specifies  whether  the  upper  or
                   lower  triangular  part  of  the  array A is to be
                   referenced as follows:
    
                   UPLO = 'U' or 'u'   Only the upper triangular part
                   of A is to be referenced.
    
                   UPLO = 'L' or 'l'   Only the lower triangular part
                   of A is to be referenced.
    
                   Unchanged on exit.
    
         N         - INTEGER.
                   On entry, N specifies the order of the  matrix  A.
                   N must be at least zero.  Unchanged on exit.
    
         ALPHA     - REAL            .
                   On  entry,  ALPHA  specifies  the  scalar   alpha.
                   Unchanged on exit.
    
         X         - COMPLEX          array of dimension at least
                   ( 1 + ( n - 1 )*abs( INCX ) ).  Before entry,  the
                   incremented  array  X  must  contain the n element
                   vector x.  Unchanged on exit.
    
         INCX      - INTEGER.
                   On entry, INCX specifies  the  increment  for  the
                   elements  of  X. INCX must not be zero.  Unchanged
                   on exit.
    
         A         - COMPLEX          array of DIMENSION ( LDA, n ).
                   Before entry with  UPLO = 'U' or 'u', the  leading
                   n  by  n upper triangular part of the array A must
                   contain the upper triangular part of the hermitian
                   matrix and the strictly lower triangular part of A
                   is not referenced. On exit, the  upper  triangular
                   part  of  the  array A is overwritten by the upper
                   triangular part of  the  updated  matrix.   Before
                   entry  with  UPLO = 'L' or 'l', the leading n by n
                   lower triangular part of the array A must  contain
                   the  lower triangular part of the hermitian matrix
                   and the strictly upper triangular part of A is not
                   referenced.  On exit, the lower triangular part of
                   the array A is overwritten by the lower triangular
                   part  of  the  updated matrix.  Note that the ima-
                   ginary parts of the diagonal elements need not  be
                   set, they are assumed to be zero, and on exit they
                   are set to zero.
    
         LDA       - INTEGER.
                   On entry, LDA specifies the first dimension  of  A
                   as declared in the calling (sub) program. LDA must
                   be at least max( 1, n ).  Unchanged on exit.
    
    
    
    


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