0
我無法存儲我的中間循環中的所有數據。當我嘗試和檢索外部for循環後運行唯一的數據,我能夠達到的數據是最終的運行。我如何將所有D的運行存儲在單個矩陣中?for循環存儲問題(嵌套for循環)
set.seed(3690)
iterations <- 20
mean_birthrate <- 0.4
stand_dev_birthrate <- 0.1
mean_survival_rate <- 0.68
stand_dev_survival <- 0.07
initial_population <- 100
period <- 20
End_Year <- 2013+period
birthrate <- rnorm(n=1,mean=mean_birthrate,sd=stand_dev_birthrate)
birthrate
survival <- rnorm(n=1,mean=mean_survival_rate,sd=stand_dev_survival)
survival
growth_rate <- birthrate - (1-survival)
growth_rate
for (k in 1:50) {
D <- numeric(period)
D[1] <- initial_population
for (i in 1:period) {
D[i+1] <- D[i] + ((rnorm(n=1,mean=mean_birthrate,sd=stand_dev_birthrate) - (1-rnorm(n=1,mean=mean_survival_rate,sd=stand_dev_survival))) * D[i])
}
print(D)
if (k==1)
plot(D, typ="l",ylab="Number of Bobcats",xlab="Year",ylim=c(50,1700),xaxt='n')
if (k>1)
lines(D,col = rgb(0,0,0,0.1),xaxt='n')
}