Created
November 20, 2012 13:11
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| persons = rnorm(100, 20,10) | |
| nYearsToRun = 500 | |
| births = deaths = pop = rep(NA,nYearsToRun) | |
| for (y in 1:nYearsToRun) { | |
| populationSize = length(persons) | |
| persons = persons+1 # age everybody | |
| # death | |
| persons <- persons[persons < rnorm(populationSize, 77, 15)] | |
| nDeaths = populationSize - length(persons) | |
| populationSize = length(persons) | |
| # births | |
| giveBirth = rbinom(populationSize,1, .02) # .1 chance of giving birth per year | |
| newPeople <- persons[giveBirth & persons < 60 ] | |
| nBirths = length(newPeople) | |
| newPeople <- rep(0, nBirths) | |
| persons = c(persons,newPeople) | |
| populationSize = length(persons) | |
| births[y] = nBirths | |
| deaths[y] = nDeaths | |
| pop[y] = populationSize | |
| } | |
| x = c(1:nYearsToRun) | |
| plot(pop ~ x, ylim=c(0,max(pop))) | |
| lines(x,deaths,col="red") | |
| lines(x,births,col="green") |
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