Bots and Simulations > Evolution and Internet Sharing Sims

100 day sim

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EricL:
This is a continuation of the sim described here.

I'll do some more analysis shortly, but a few thigns to note:

Here is the DNA of the "Best bot":

 start
 dist angle and
 -25 *.up dup ceil *.up pow .dn store
 52 mult <
 store
 store
 add pyth

Note that start command.  I didn't put it there, it evoled.  There used to be garbage ahead of it.  Over time, selection favorred a genome with the start statement earlier and earlier until we arrived at the opimal.  

Average DNA length has dropped.  The sim started with zerobots of length 30.  Now the average DNA length is below 20.  I talk about why this is the case here.

googlyeyesultra:
I'm eagerly awaiting the link. After all, since you don't have ridiculous numbers of deletions or any dna costs, all I can think of is more dna increases the likelyhood of deletrious mutations once you've managed to adapt to your situation.

EricL:
Found it (finially!).  Yup, you guessed it.  Here's the relevant text...

I never use DNA costs in my evo sims as I do not want any cost-based selective pressure towards smaller DNA. Maca is exactly correct - such costs will serve to shrink DNA length over time all else being equal.

I should point out that even without any DNA costs, selection pressures still operate indirectly on DNA length. A longer genome will mutate more often (mutations are proprotional to genome length). Since most mutations are deleterious, having a longer genome means your functionality is more likely to degrade due to mutations. Thus, selection tends to place slight downward pressure on genome length even without costs, all else being equal. Of course, this gets balanced out by useful adaptations which by definition must utilize DNA. So, if there is selection pressure to aquire new traits in your sim, the genome will grow in length all else being equal. If not, it will shrink, to the point where the code for critical adaptations starts to be impacted. Ignoring viruses, the average genome length in a sim without DNA costs will be the balance point of these two opposing forces.

Numsgil:
Interesting, but I think the bot is at a dead end.  The DNA basically reduces to dist angle -1300 store.  Unless I miss my mark, it's basically doing dist angle .repro store

You're not seeing them move or shoot anymore, are you?  Unless the "best bot" is actually a genetic dead end and there are other species floating around, it looks like your bots are less sophisticated than they were the last time you showed us your sim.

Numsgil:
Let me amend.  It also looks like it's doing 0 0 pow .dn store.  So it should be moving a little bit each cycle.

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