cgthrz(3P) Sun Performance Library cgthrz(3P)NAMEcgthrz - Gather and zero.
SYNOPSIS
SUBROUTINE CGTHRZ(NZ, Y, X, INDX)
COMPLEX Y(*), X(*)
INTEGER NZ
INTEGER INDX(*)
SUBROUTINE CGTHRZ_64(NZ, Y, X, INDX)
COMPLEX Y(*), X(*)
INTEGER*8 NZ
INTEGER*8 INDX(*)
F95 INTERFACE
SUBROUTINE GTHRZ([NZ], Y, X, INDX)
COMPLEX, DIMENSION(:) :: Y, X
INTEGER :: NZ
INTEGER, DIMENSION(:) :: INDX
SUBROUTINE GTHRZ_64([NZ], Y, X, INDX)
COMPLEX, DIMENSION(:) :: Y, X
INTEGER(8) :: NZ
INTEGER(8), DIMENSION(:) :: INDX
C INTERFACE
#include <sunperf.h>
void cgthrz (const int nz, floatcomplex* y, floatcomplex* x, const int*
indx);
void cgthrz_64 (const long nz, floatcomplex* y, floatcomplex* x, const
long* indx);
PURPOSE
CGTHRZ - Gathers the specified elements from a vector y in full storage
form into a vector x in compressed form. The gathered elements of y
are set to zero. Only the elements of y whose indices are listed in
indx are referenced.
do i = 1, n
x(i) = y(indx(i))
y(indx(i)) = 0
enddo
ARGUMENTS
NZ (input) - INTEGER
Number of elements in the compressed form. Unchanged on exit.
Y (input/output)
Vector in full storage form. Gathered elements are set to
zero.
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 cgthrz(3P)