Simple ecosystem simulation (NetLogo) - Revision history

Fisp00 at 18:47, 30 May 2016

2016-05-30T18:47:41Z

2016-05-30T18:00:24Z

‎Simple ecosystem simulation

2016-05-30T17:50:58Z

‎Fuzzing

2016-05-30T17:49:20Z

‎Attached files

2016-05-30T17:48:09Z

‎Attached files

2016-05-30T17:47:42Z

‎Attached files

2016-05-30T17:36:21Z

‎Attached files

2016-05-30T17:14:48Z

‎Program functions

2016-05-30T17:14:31Z

‎Program functions

2016-05-30T17:13:40Z

‎Conclusion

← Older revision		Revision as of 18:47, 30 May 2016
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	<nowiki>		<nowiki>
	algae-setup-count,herbivores-setup-count,carnivores-setup-count,algae-sprout-ticks,algae-sprout-amount,ecosystem-stability-rate</nowiki>		algae-setup-count,herbivores-setup-count,carnivores-setup-count,algae-sprout-ticks,algae-sprout-amount,ecosystem-stability-rate</nowiki>
		+
		+	[[User:Fisp00\|Petr Fiser]] ([[User talk:Fisp00\|talk]]) 20:47, 30 May 2016 (CEST)

@@ Line 12: / Line 12: @@
 Therefore swimbots are simulation where agents can move around in a "pool" and have two basic goals - 1) to eat and 2) to reproduce. Everything else emerges on its own during the simulation.
-Official web of the Swimbots is www.swimbots.com (TODO link) where the complete simulation app can be downloaded.
+Official web of the Swimbots is www.swimbots.com where the complete simulation app can be downloaded.
 For purpose of our simulation we blended those three topics together and the result was a small artificial ecosystem which could have existed on the primeval Earth.

@@ Line 314: / Line 314: @@
 ==== Fuzzing ====
-In  total, we examined one hundred randomly generated models. We ran each model one hundred times and if there were still all three creature tzpes alive at the tick 10000, we considered the model as stable.
+In  total, we examined one hundred randomly generated models. We ran each model one hundred times and if there were still all three creature types alive at the tick 10000, we considered the model as stable.
 In the end, we computed '''ecosystem-stability-rate''' as a number of times we managed to create stable ecosystem divided by 100. Therefore, '''ecosystem-stability-rate''' is a probability of creating stable ecosystem when running particular model (each run has random agent placement). We placed results into a CSV file of the structure:

@@ Line 412: / Line 412: @@
 [[File:Fisp00_simple-ecosystem.nlogo]] - This is a source file of whole simulation as described in this text.
-[[File:Fisp00_simple-ecosystem-res.xls]] - This is a result file from fuzzing models. It contains 100 models (one per line), each was ran 100 times to determine '''ecosystem-stability-rate''' - a probability with which particular configuration is able to exist in the long run, beyond tick 10000.
+[[File:Fisp00_simple-ecosystem-res.xls]] - This is a result file from fuzzing models. It contains 100 models (one per line), each was ran 100 times to determine '''ecosystem-stability-rate''' - a probability with which particular configuration is able to exist in the long run, beyond tick 10000. Each line of the file contains initial parameters of a model and the last column is '''ecosystem-stability-rate''':
   <nowiki>
 algae-setup-count,herbivores-setup-count,carnivores-setup-count,algae-sprout-ticks,algae-sprout-amount,ecosystem-stability-rate</nowiki>

@@ Line 410: / Line 410: @@
 == Attached files ==
-[[File:Fisp00_simple-ecosystem.nlogo]]
+[[File:Fisp00_simple-ecosystem.nlogo]] - This is a source file of whole simulation as described in this text.
-[[File:Fisp00_simple-ecosystem-res.xls]]
+[[File:Fisp00_simple-ecosystem-res.xls]] - This is a result file from fuzzing models. It contains 100 models (one per line), each was ran 100 times to determine '''ecosystem-stability-rate''' - a probability with which particular configuration is able to exist in the long run, beyond tick 10000.
   <nowiki>
-algae-setup-count,herbivores-setup-count,carnivores-setup-count,algae-sprout-ticks,algae-sprout-amount,ecosystem-stability-rate
+algae-setup-count,herbivores-setup-count,carnivores-setup-count,algae-sprout-ticks,algae-sprout-amount,ecosystem-stability-rate</nowiki>

← Older revision		Revision as of 17:36, 30 May 2016
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	== Attached files ==		== Attached files ==
−	~~TODO~~: ~~netlogo simulation, results csv~~	+	[[File:Fisp00_simple-ecosystem.nlogo]]
		+
		+	[[File:Fisp00_simple-ecosystem-res.xls]]

@@ Line 167: / Line 167: @@
 * '''breed-carnivores [amount]''' - creates carnivores
 * '''(reporter) new-direction [previous-direction]''' - determines if creature should change its direction
 * '''fuzz''' and '''hot-fuzz''' functions - those are not a part of the model but were used for fuzzing

@@ Line 383: / Line 383: @@
 We managed to find out following minimal initial parameters for which the ecosystem became, in 1% (or less) cases, stable.
 * '''algae-setup-count''' = 200
 * '''herbivores-setup-count''' = 50
@@ Line 389: / Line 390: @@
 * '''algae-sprout-amount''' = 11
-In the problem statement, there was a condition that when creatures split, their "childen" inherit '''speed''' attribute of a parent. Thanks to this, simple evolutionary pattern emerged in the model - faster creatures were more successful when competing for food and did split themselves more. It also posed a risk of destabilizing whole model because creatures would become too good in consuming their food.
+The most stable ecosystem we managed to find is not minimal, but the probability this ecosystem becomes stable is (astonishing) 14%. Its initial parameters are:
 == Future development ==