rnorm的函数中加入sample应该如何理解

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mixn <- function (n, a=-1, b=1)
{rnorm(n, sample(c(a,b),n,replace=T))}

请问在rnorm中，又加入了sample函数，应该怎么理解呢？

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关键词：Sample 如何理解 AMPL Norm MPL 如何

The random number is generated n times, each element in n has a mean of +1 or -1.

waterhorse 发表于 2016-8-10 11:24
The random number is generated n times, each element in n has a mean of +1 or -1.

thx a lot!

waterhorse 发表于 2016-8-10 11:24
The random number is generated n times, each element in n has a mean of +1 or -1.

btw, what about the variance of the random number?

By default the variance (standard deviation) is set to 1; rnorm(n, mean, sd).