Question about reproduction in SEV

Lord_Shleepy · #1 November 11th, 2006, 04:15 AM

Actually, I have a couple of them.

I have always been annoyed that the default reproduction rates in SEIV are ridiculous (at least for humanish races). They are usually displayed as being between 10 and 20% - which is not that bad when calculated like simple interest but since when compounded 10 times each year it becomes outrageous. A population of 50M would grow to 55M using the first method (at 10%) but about 130M using the second. That means that about 60% of the population is less than one year of age! Talk about a baby boom!

So I was wondering if anyone had noticed how this works in SEV.

Question #1: Can reproduction rates include decimal values (more appropriate for exponential growth)?

Question #2: Can reproduction rates be represented using a formula?

This of course, is all assuming that reproduction rates can still be changed (and that they actually work the way that they are supposed to).

douglas · #2 November 11th, 2006, 04:23 AM

Compounding doesn't work that way. 10% interest compounded 10 times does not mean add 10% 10 times. It means add 10/10 = 1% 10 times, and this is how SEIV and (presumably) SEV calculate population growth.

Sorry, but I'll have to let someone else answer your questions.

President_Elect_Shang · #3 November 11th, 2006, 04:40 AM

Reproduction rates can be adjusted the same way as in SE4. Open the Settings.txt file and search for �Reproduction Check Frequency� to control how often growth is checked for; the default being every turn (1). Also search for �Race Starting Percent Reproduction� which controls the reproduction rate.

Quote:

Lord_Shleepy said:
Question #1: Can reproduction rates include decimal values (more appropriate for exponential growth)?

Yes. I use 4.2% percent with a check every turn (1) in my Mod. I haven�t done the math yet but it seems to be working fine.

Quote:

Lord_Shleepy said:
Question #2: Can reproduction rates be represented using a formula?

No only spaces that say �Formula� can take formula. That�s not say that you can�t add in an ability for reproduction and put a formula with that. It depends on what you�re goal is.

neofit · #4 November 11th, 2006, 06:35 AM

Speaking of outrageous reproduction rates... I'm playing v1.13 with the Balance Mod v0.96, as Humanoids, rock/oxygen. A few turns ago I colonized a Small Rock/Methane planet (domed colony), Unpleasant conditions, 118mR/yr, 0.56g gravity, 91deg temperature.

Stardate 2404.8 population: 22M/250M
Stardate 2404.9 population: 139M/250M
Stardate 2405.0 population: 223M/250M
Stardate 2405.1 population: 250M/250M

The rates on my other dozen or so planets seem OK though.

neofit · #5 November 11th, 2006, 10:42 AM

Mea culpa, figured this one out. Somehow the Xi'Chung migrated onto this planet, I have a treaty allowing this with them and must have missed how they transferred 100M+ people onto my world in one turn. They breath methane and are breeding like insect on this planet. Actually they ARE insects. Not too shabby, got me a non-domed mineral-rich colony, too bad it's the only methane planet in my systems

.

Captain Kwok · #6 November 11th, 2006, 03:30 PM

If you jettison or move your own population from the planet, you'll be able to get your colony undomed and access to the full amount of facilities etc.

NullAshton · #7 November 11th, 2006, 03:59 PM

Those aren't really reproduction rates... In Space Empires V, your population migrates between planets. Thus, only a small part of that is from reproduction, the rest is unhappy people leaving your homeworld and going to get a nice house and job in the new, pristine colonies.

Lord_Shleepy · #8 November 13th, 2006, 07:55 PM

Quote:

douglas said:
Compounding doesn't work that way. 10% interest compounded 10 times does not mean add 10% 10 times. It means add 10/10 = 1% 10 times, and this is how SEIV and (presumably) SEV calculate population growth.

Sorry, but I'll have to let someone else answer your questions.

:-) Yes, I know that's the way it is supposed to work. It seemed like SEIV was using the whole 10% each turn tho...or something close to it. Either way, it still makes waaay too many babies!

Thanks for the correction
(Thank you sir! May i have another?)

Wenin · #9 November 13th, 2006, 08:12 PM

Quote:

NullAshton said:
Those aren't really reproduction rates... In Space Empires V, your population migrates between planets. Thus, only a small part of that is from reproduction, the rest is unhappy people leaving your homeworld and going to get a nice house and job in the new, pristine colonies.

This only occurs with the planets that have your breathable atmosphere, otherwise it is pure reproduction.... unless you have a treaty allowing foreign breathing races to migrate.

While SEV may allow decimal points in percentages.... does it track population at the decimal point level as well?

Will · #10 November 14th, 2006, 01:00 AM

Quote:

Lord_Shleepy said:
It seemed like SEIV was using the whole 10% each turn tho...or something close to it.

SEIV by default checked for population growth every turn, using (Reproduction_Rate / 10)% each turn, rounded up. So, if you had a colony of 20M, and reproduction of 10%, on the next turn the population would grow by 20M * 1% = 0.2M, rounded up is 1M. So, with low populations, growth always happens at 1M per turn, unless the reproduction rate is 0%. That would skew reproduction rates really high for those colonies.