Re: [Swarm-Support] binary numbers

[Russell Standish]

If the bitstrings fit into the system wordsize (32 bits on average
PCs), then you can use the standard bit manipulation operators of C:

x|=1<<i    - sets the ith bit of x
(x&1<<i)!=0     - returns the ith bit of 0

If you have more bits than the wordsize, then you'll need to concoct a
BitSet object to do your work. C++ has a number of these - I'm not so
familiar with what's available for Obj C.

                                        Cheers

Marcello wrote:
> 
> Sorry if this comes a bit off the topic:
> Does anybody have a nice and clean way to handle binary numbers. I would
> like to store some information about the agent as a binary number
> (0100101), and have a call that returns exactly the digit I'd like.
> Thus, if the agent has myBin=01001, the call [agent gimmeBin: 1] returns
> 0, [agent gimmeBin: 2] returns 1, [agent gimmeBin: 3] returns 0, and so
> on. Of course, I could write gimmeBin as a sequence of if-then, but it
> does not sound very neat.
> Any hint?
> thanks
> marcello
> On Fri, 2003-07-04 at 15:03, Paul Johnson wrote:
> > au contraire!
> > 
> > I have put both swarm-2.1.143 and 2.1.145 up there some time ago.
> > 
> > Although the swarm link to the ftp server won't let me in now, I can get 
> > there from
> > 
> > ftp://ftp.santafe.edu/pub/swarm/src/testing.
> > 
> > Agustin Ramos Fonseca wrote:
> > > Thank you for your advise.
> > > 
> > > I'd like to know where I can get the swarm 2.1.143.20030512 sources,
> > > I looked for them at
> > > ftp://ftp.swarm.org/pub/swarm/src/testing/
> > > but they aren't there.
> > > 
> > > I'll try to upgrade my RH to 7.3 but I think my old PC won't support it
> > > (mainly because disk space, all rpm updates are disk consuming)
> > > 
> > > I'm interested in the sources because I'm interested in modelling and
> > > in the inner workings of this tool. So I'll try to build the sources.
> > > 
> > > Thanks again
> > > 
> > > Agustín T.Ramos Fonseca
> > 
> > 
> > -- 
> > Paul E. Johnson                       email: address@hidden
> > Dept. of Political Science            http://lark.cc.ku.edu/~pauljohn
> > University of Kansas                  Office: (785) 864-9086
> > Lawrence, Kansas 66045                FAX: (785) 864-5700
> > 
> > _______________________________________________
> > Support mailing list
> > address@hidden
> > http://www.swarm.org/mailman/listinfo/support
> -- 
> Marcello Gallucci (Ph.D)
> Department of Social Psychology
> Free University
> Van der Boechorststraat 1
> 1081 BT Amsterdam (NL)
> Tel. +31(0)20 4448846
> Fax  +31 (0)20 4448921
> 
> _______________________________________________
> Support mailing list
> address@hidden
> http://www.swarm.org/mailman/listinfo/support
> 



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