Re: Question on partitioning a set of agents.

[Marcus G. Daniels]

>>>>> "JA" == Jason Alexander <address@hidden> writes:

JA> For one of my models I need to randomly partition a set of agents
JA> (stored as a list) into N disjoint classes, where each class is
JA> equiprobable.

Collection's -beginPermuted: is one way to do this.

#import <simtools.h> // initSwarm
#import <collections.h> // List
#import <defobj/Create.h> // CreateDrop
#import <misc.h> // sprintf

@interface Integer: CreateDrop
{
  int value;
}
- setValue: (int)value;
- (int)getValue;
@end

@implementation Integer
- setValue: (int)theValue
{
  value = theValue;
  return self;
}

- (int)getValue
{
  return value;
}

@end

#define INTEGER(value) \
  [[[Integer createBegin: globalZone] setValue: value] createEnd]

#define PARTITION_SIZE 5
#define PARTITION_COUNT 10

int
main (int argc, const char **argv)
{
  id <List> l;
  id <Index> li;
  id obj;
  unsigned i;
  
  initSwarm (argc, argv);

  l = [List create: globalZone];
  for (i = 0; i < PARTITION_SIZE * PARTITION_COUNT; i++)
    [l addFirst: INTEGER (i)];

  li = [l beginPermuted: globalZone];
  for (i = 0; obj = [li next]; i++)
    {
      printf ("partition#: %u [%u] value: %u\n",
              i / PARTITION_SIZE, i % PARTITION_SIZE, [obj getValue]);
    }
  [li drop];
  [l deleteAll];
  [l drop];
}

/*
Local Variables:
compile-command: "/opt/gnu/bin/gcc -o randomindex -g -Wno-import 
-L/opt/SUNWtcl/8.0/sun4/lib -R/opt/SUNWtcl/8.0/sun4/lib -L/opt/SDGblt/2.4g/lib 
-R/opt/SDGblt/2.4g/lib -L/opt/SDGlibffi/1.20/lib -R/opt/SDGlibffi/1.20/lib 
-L/opt/SDGswarm/1.4.1/lib -L/opt/SDGzlib/1.1.3/lib -L/usr/local/X11/lib 
-R/usr/local/X11/lib -L/usr/openwin/lib -R/usr/openwin/lib 
-L/opt/SDGhdf5/1.0.1/lib -I/opt/SDGswarm/1.4.1/include randomindex.m -lanalysis 
-lsimtools -lsimtoolsgui -lactivity -ltkobjc -lrandom -lobjectbase  -ldefobj 
-lcollections -lmisc  -ltclobjc -ltk8.0 -ltcl8.0 -lBLT -lsocket -ldl -lnsl 
-L/usr/openwin/lib -lhdf5 -lpng -lz -lXpm -lX11 -lffi -lm -lobjc -lpthread 
-lposix4"
End:
*/


                  ==================================
   Swarm-Modelling is for discussion of Simulation and Modelling techniques
   esp. using Swarm.  For list administration needs (esp. [un]subscribing),
   please send a message to <address@hidden> with "help" in the
   body of the message.
                  ==================================