Created
December 10, 2014 10:31
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二項分布と正規分布とポアソン分布のずれをアニメーションにする
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s <- 100 | |
index_h <- 500^(((1:s)-1)/(s-1)) | |
index <- as.integer(c(index_h, rev(index_h))) | |
for (i in 1:length(index)) { | |
png(sprintf("plot_%04d.png", i), width=500, height=500) | |
np <- index[i] | |
n <- 1000 | |
p <- np/n | |
q <- 1 - p | |
x <- 0:n | |
xlim <- c(np-n*p*q -10,np+n*p*q +10) | |
ylim <- c(0,max(dbinom(x, size=n, prob=p))*1.5) | |
plot(dbinom(x, size=n, prob=p), xlab="", ylab="", xlim=xlim, ylim=ylim, type="l", col="blue") | |
par(new=T) | |
plot(dnorm(x, mean=n*p, sd=sqrt(n*p*q)), xlab="", ylab="", xlim=xlim, ylim=ylim, type="l", col="green") | |
par(new=T) | |
plot(dpois(x, lambda=np), xlab="", ylab="", xlim=xlim, ylim=ylim, type="l", col="red") | |
legend("topleft", legend=c("dbinom", "dnorm", "dpois"), col=c("blue", "green", "red"), lty=1) | |
text(np, 0, paste0("np=", np)) | |
dev.off() | |
} |
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