Re: SWARM problems (followup question)

[Doug Donalson]

Paul,

   First, aZone=[self getZone] is the same thing as the [self getZone] in the 
create
statement.  If  I were to complete something I probably started LONG ago, I 
would
put aZone in the create statement so save processing time on function calls.
Obviously I forgot to complete it, thanks for reminding me.  :-)

The "offsetof" is a Swarm list option.  It allows you to send a message to a 
list of
the sort [aList remove: aDeadBug].

Normally you would create an index and then do a:

while( (aBug=[index next]) != aDeadBug] )

This just automates it.

What would really be nice is if it didn't have to traverse the list everytime 
(Hive:
hint hint hint ).  If the member is known and the remove could be done directly 
from
the member then a high use O(n) function could be changed into an O(1).

That is one of the two things at the top pf my Swarm wish list, and it really 
is a
"list".

Cheers,

   D3

Paul Johnson wrote:

> Dear Doug:
> Thanks for sharing that code.  I understood almost all, except
> I wonder what offsetof( x, y ) is.  Is that a ordinary c function
> you have written?  What is its purpose?
>
> What job are you aiming to get done with the customization of the list,
> I guess I wonder.
>
> What purpose do you serve by
>
> aZone=[self getZone]; ???
>
> Can't learn if I don't ask questions, you know!
>
> pj
>
> On Wed, 24 Jun 1998, Doug Donalson wrote:
>
> > Here is create end where I set up the four lists.
> >
> > -createEnd
> > {
> > id listType;
> > id aZone;
> >
> >   active=1;
> >   aZone=[self getZone];
> >
> >   listType = [List customizeBegin: [self getZone]];
> >   [listType setIndexFromMemberLoc: offsetof( AdultAphytis, listMember )];
> >   listType = [listType customizeEnd];
> >
> >   adultAphytisList = [listType create: [self getZone]];
> >
> >   listType = [List custiomizeBegin: [self getZone]];
> >   [listType setIndexFromMemberLoc: offsetof( AdultRedScale, listMember )];
> >   listType = [listType customizeEnd];
> >
> >    adultRedScaleList=[listType create: [self getZone]];
> >
> >   listType = [List customizeBegin: [self getZone]];
> >   [listType setIndexFromMemberLoc: offsetof( JuvenileAphytis, listMember )];
> >   listType = [listType customizeEnd];
> >
> >    juvenileAphytisList = [listType create: [self getZone]];
> >
> >   listType = [List customizeBegin: [self getZone]];
> >   [listType setIndexFromMemberLoc: offsetof( JuvenileRedScale, listMember 
> > )];
> >   listType = [listType customizeEnd];
> >
> >   juvenileRedScaleList=[listType create: [self getZone]];
> >
> >
> >    return self;
> > }
> >
> > I hope this helps a little?
> >
> > Cheers,
> >
> >         D3
> >
> >
> > Laurence wrote:
> >
> > > Hi,
> > >
> > > I'm currently working on a model of chemotaxis using SWARM, and need some
> > > advice.  I use objects to represent enzymes / proteins in the system that
> > > signal each other.  I have different classes to represent each type of
> > > component, and the present program contains 1 object of each class.  I now
> > > need to extend it so that each protein type is represented in it's 
> > > relative
> > > concentration.
> > >
> > > 1) How can I create / manage a population of objects of different classes?
> > > Do I need to use lists? Do I need a seperate list to hold the objects of
> > > each class? Can you point me in the direction of some code that does 
> > > similar
> > > stuff?
> > >
> > >
> > >
> > > Best wishes, Laurence (address@hidden)
> > > ---------------------
> > > http://www.csc.liv.ac.uk/~laurence
> > >
> > >                   ==================================
> > >    Swarm-Support is for discussion of the technical details of the day
> > >    to day usage of Swarm.  For list administration needs (esp.
> > >    [un]subscribing), please send a message to <address@hidden>
> > >    with "help" in the body of the message.
> > >                   ==================================
> >
> >
> >
> > --
> > ************************************************************************
> > * Doug Donalson                                          * Office: (805)
> > 893-2962
> > * Ecology, Evolution, and Marine Biology   * Home:   (805) 961-4447
> > * UC Santa Barbara                                      * email
> > address@hidden
> > * Santa Barbara Ca. 93106                           *
> > ************************************************************************
> > *
> > *   The most exciting phrase to hear in science, the one that
> > *   heralds new discoveries, is not "EUREKA" (I have found it) but
> > *   "That's funny ...?"
> > *
> > *       Isaac Asimov
> > *
> > ************************************************************************
> >
> >
> >
> >                   ==================================
> >    Swarm-Support is for discussion of the technical details of the day
> >    to day usage of Swarm.  For list administration needs (esp.
> >    [un]subscribing), please send a message to <address@hidden>
> >    with "help" in the body of the message.
> >                   ==================================
> >
>
> Paul E. Johnson                      address@hidden
> Dept. of Political Science           http://lark.cc.ukans.edu/~pauljohn
> University of Kansas                 Office: (913) 864-9086
> Lawrence, Kansas 66045               FAX: (913) 864-5700
>
>
>                   ==================================
>    Swarm-Support is for discussion of the technical details of the day
>    to day usage of Swarm.  For list administration needs (esp.
>    [un]subscribing), please send a message to <address@hidden>
>    with "help" in the body of the message.
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--
************************************************************************
* Doug Donalson                                          * Office: (805) 
893-2962
* Ecology, Evolution, and Marine Biology   * Home:   (805) 961-4447
* UC Santa Barbara                                      * email
address@hidden
* Santa Barbara Ca. 93106                           *
************************************************************************
*
*   The most exciting phrase to hear in science, the one that
*   heralds new discoveries, is not "EUREKA" (I have found it) but
*   "That's funny ...?"
*
*       Isaac Asimov
*
************************************************************************



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   to day usage of Swarm.  For list administration needs (esp.
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