Framsticks

I admit, that was a pretty clever hack. But it is easier to do piece-wise
functions.

Lets say you want to compare the velocity of small creatures ( 3-5 sticks),
with large creatures (10-20 sticks). Put this code in the fitness formula:

// start
var validator = 0;
if ( ( this.strsiz >= 3 ) && ( this.strsiz <= 5 ) || ( this.strsiz >=
10 ) && ( this.strsiz <= 20 ) ) validator = 1;

return this.velocity*validator; //sets fitness to 0 if conditions not
met
// end

> I have this idea that we can try breaking up different size ranges for a
> specific goal, then compare the designs by size. I bet there's some
> interesting results waiting to be found under this particular proverbial
> rock.
>
> Any suggestions on a range of settings for the varibles? And are there
> exponet/power and root functions that I'm not aware of for the fitness
> functions? I'd love a cap or range ability. The method I use is really
> just a hack involving some algebraic equations' properties. Even an
> absolute value, signum, or modulas function would be great!
>
> Thanks for the great program, and hope to hear from you soon - Joe

Dear Joe,

Sorry for answering so late.
Yes, you have a wide range of possibilities in your fitness functions.
You can develop a regular function, as in any programming language,
with conditions, loops, etc.

For a list of basic math functions, see

http://www.framsticks.com/common/script/docs/c_math.html

and the fitness function may for example look like

---
if (this.distance<50) return 50;
if (this.velocity<0) return 0;
return Math.abs(this.strsiz-120);
---

or something like

--
var model = Model.newFromGeno(this.geno);
return this.strsiz / model.size_x;
--

good luck,

Maciej