sdoti(3P) Sun Performance Library sdoti(3P)NAMEsdoti - Compute the indexed dot product.
SYNOPSIS
REAL FUNCTION SDOTI(NZ, X, INDX, Y)
REAL X(*), Y(*)
INTEGER NZ
INTEGER INDX(*)
REAL FUNCTION SDOTI_64(NZ, X, INDX, Y)
REAL X(*), Y(*)
INTEGER*8 NZ
INTEGER*8 INDX(*)
F95 INTERFACE
REAL FUNCTION DOTI([NZ], X, INDX, Y)
REAL, DIMENSION(:) :: X, Y
INTEGER :: NZ
INTEGER, DIMENSION(:) :: INDX
REAL FUNCTION DOTI_64([NZ], X, INDX, Y)
REAL, DIMENSION(:) :: X, Y
INTEGER(8) :: NZ
INTEGER(8), DIMENSION(:) :: INDX
C INTERFACE
#include <sunperf.h>
float sdoti (const int nz, const float* x, const int* indx, const
float* y);
float sdoti_64 (const long nz, const float* x, const long* indx, const
float* y);
PURPOSE
SDOTI Compute the indexed dot product of a real sparse vector x stored
in compressed form with a real vector y in full storage form.
dot = 0
do i = 1, n
dot = dot + x(i) * y(indx(i))
enddo
ARGUMENTS
NZ (input)
Number of elements in the compressed form. Unchanged on exit.
X (input)
Vector in compressed form. Unchanged on exit.
INDX (input)
Vector containing the indices of the compressed form. It is
assumed that the elements in INDX are distinct and greater than
zero. Unchanged on exit.
Y (input)
Vector in full storage form. Only the elements corresponding
to the indices in INDX will be accessed.
3rd Berkeley Distribution 6 Mar 2009 sdoti(3P)
