R語言中set.seed()函數的作用

set.seed(）用於保證多次生成隨機數的結果一致。

1、

par(mfrow = c(2,2))
a <- rnorm(10)
plot(a, pch = 19, cex =2)

b <- rnorm(10)
plot(b, pch = 19, cex =2)

set.seed(100)
c <- rnorm(10)
plot(c, pch = 19, cex = 2)

set.seed(100)
d <- rnorm(10)
plot(d, pch = 19, cex = 2)