dgthr(3P) Sun Performance Library dgthr(3P)NAMEdgthr - Gathers specified elements from y into x.
SYNOPSIS
SUBROUTINE DGTHR(NZ, Y, X, INDX)
DOUBLE PRECISION Y(*), X(*)
INTEGER NZ
INTEGER INDX(*)
SUBROUTINE DGTHR_64(NZ, Y, X, INDX)
DOUBLE PRECISION Y(*), X(*)
INTEGER*8 NZ
INTEGER*8 INDX(*)
F95 INTERFACE
SUBROUTINE GTHR([NZ], Y, X, INDX)
REAL(8), DIMENSION(:) :: Y, X
INTEGER :: NZ
INTEGER, DIMENSION(:) :: INDX
SUBROUTINE GTHR_64([NZ], Y, X, INDX)
REAL(8), DIMENSION(:) :: Y, X
INTEGER(8) :: NZ
INTEGER(8), DIMENSION(:) :: INDX
C INTERFACE
#include <sunperf.h>
void dgthr (const int nz, const double* y, double* x, const int* indx);
void dgthr_64 (const long nz, const double* y, double* x, const long*
indx);
PURPOSE
DGTHR - Gathers the specified elements from a vector y in full storage
form into a vector x in compressed form. Only the elements of y whose
indices are listed in indx are referenced.
do i = 1, n
x(i) = y(indx(i))
enddo
ARGUMENTS
NZ (input) - INTEGER
Number of elements in the compressed form. Unchanged on exit.
Y (input)
Vector in full storage form. Unchanged on exit.
X (output)
Vector in compressed form. Contains elements of y whose
indices are listed in indx on exit.
INDX (input) - INTEGER
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.
3rd Berkeley Distribution 6 Mar 2009 dgthr(3P)
