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sspmv (3)
  • >> sspmv (3) ( Solaris man: Библиотечные вызовы )
  • 
    NAME
         sspmv - perform the matrix-vector operation   y := alpha*A*x
         + beta*y
    
    SYNOPSIS
         SUBROUTINE SSPMV ( UPLO, N, ALPHA, AP,  X,  INCX,  BETA,  Y,
                   INCY )
    
         REAL ALPHA, BETA
    
         INTEGER INCX, INCY, N
    
         CHARACTER*1 UPLO
    
         REAL AP( * ), X( * ), Y( * )
    
    
    
         #include <sunperf.h>
    
         void sspmv(char uplo, int n, float alpha, float *sap,  float
                   *sx, int incx, float sbeta, float *sy, int incy) ;
    
    PURPOSE
         SSPMV  performs the matrix-vector operation y := alpha*A*x +
         beta*y, where alpha and beta are scalars, x and y are n ele-
         ment vectors and A is an n by n symmetric  matrix,  supplied
         in packed form.
    
    
    PARAMETERS
         UPLO      - CHARACTER*1.
                   On entry, UPLO  specifies  whether  the  upper  or
                   lower  triangular part of the matrix A is supplied
                   in the packed array AP as follows:
    
                   UPLO = 'U' or 'u'   The upper triangular part of A
                   is supplied in AP.
    
                   UPLO = 'L' or 'l'   The lower triangular part of A
                   is supplied in AP.
    
                   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.
    
         AP        - REAL             array of DIMENSION at least
                   ( ( n*( n + 1 ) )/2 ).  Before entry with  UPLO  =
                   'U'  or  'u',  the array AP must contain the upper
                   triangular part of  the  symmetric  matrix  packed
                   sequentially,  column  by  column, so that AP( 1 )
                   contains a( 1, 1 ), AP( 2 ) and AP( 3 ) contain a(
                   1,  2  )  and  a(  2, 2 ) respectively, and so on.
                   Before entry with UPLO = 'L' or 'l', the array  AP
                   must contain the lower triangular part of the sym-
                   metric  matrix  packed  sequentially,  column   by
                   column,  so that AP( 1 ) contains a( 1, 1 ), AP( 2
                   ) and AP( 3 ) contain a( 2, 1 )  and  a(  3,  1  )
                   respectively, and so on.  Unchanged on exit.
    
         X         - REAL             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.
    
         BETA      - REAL            .
                   On entry, BETA specifies  the  scalar  beta.  When
                   BETA is supplied as zero then Y need not be set on
                   input.  Unchanged on exit.
    
         Y         - REAL             array of dimension at least
                   ( 1 + ( n - 1 )*abs( INCY ) ).  Before entry,  the
                   incremented  array  Y  must  contain the n element
                   vector y. On exit, Y is overwritten by the updated
                   vector y.
    
         INCY      - INTEGER.
                   On entry, INCY specifies  the  increment  for  the
                   elements  of  Y. INCY must not be zero.  Unchanged
                   on exit.
    
    
    
    


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