"zone" or "getZone"? and one additiona question.

[Jae Chan Oh]

Hi Glen, thansk a lot for all your help. My program
seems to be very close to a workable version.

Two questions though:

(1)
In an older version of GA lib. by Merelo, they use "zone" for
the argument for createBegin. i.e. as follows:
    gen = [BinChromosome createBegin: zone];

Instead, I would like to use:
    gen = [BinChromosome createBegin: [self getZone]]

What are the differences? (I'm using "zone" for my current 
version since I'm using old version of GA lib but...)

(2)
I have a strange error that I can get around it but I don't like
the error anyway (and who does?):

I have a method called "updatePersonEnergy" for a Person class.

When I try to call this method as follows I get core dump
in the middle of program run. I mean the method is called
succefully for, say, 5 or 6 times then the core dump.

    energySpent1 =  -((double) (numInspected * inspectCost));
    [self updatePersonEnergy: energySpent1];

So I changed the above line as follows:

  energySpent1 =  -((double) (numInspected * inspectCost));

  if (energySpent1 + [self getPersonEnergy] < 0.0)
     energySpent1 = 0.0;
  else if (energySpent1 + [self getPersonEnergy] > MAX_ENERGY)
     energySpent1 = MAX_ENERGY;

  [self updatePersonEnergy: energySpent1];

Then it works fine. Now wait! wait not so fast. :-)

I already do have these guard statements of "ifs" in my updatePersonEnergy 
method as follows.

-updatePersonEnergy: (double) v
  {
  double temp;
  if ((energy + v) < 0.0)
     energy = 0.0;
  else if ((energy + v) > MAX_ENERGY)
     energy = MAX_ENERGY;
  else
     energy = energy +  v;
  return self;
  }

Now I can only conclude that the "updatePersonEnergy" method does not like to
receive a big number as an argument. The energySpent with the if statements
can be as big as +80*80*1 or as small as -80*80*1. But these are not that
big numbers though. BTW, energySpent1 is declared as a double type so 
it should be compatible with the argument type of "updatePersonEnergy".
But again, when I trim the value with the above if statement, the
value can be from 0 to say 500. Without the trim, 
I get error like: "can not recognize method updatePersonEnergy in Activity 
for Each." after 5 or 6 successful call to the method "updatePersonEnergy".
Any ideas?

Thank you,

-Jae