(This article was first published on

**The stupidest thing... » R**, and kindly contributed to R-bloggers)This morning, I started a tutorial for folks whose knowledge of R is (like mine) stuck in 2001.

Yesterday I started reading the Rcpp book, and on page 4 there’s an example using the R function `replicate`

, which (a) I’d never heard before, and (b) is super useful.

I mean, I often write code like this, for a bootstrap:

x <- rnorm(2500) sapply(1:1000, function(a) quantile(sample(x, replace=TRUE), c(0.025, 0.975)))

But I could just be writing

x <- rnorm(100) replicate(1000, quantile(sample(x, replace=TRUE), c(0.025, 0.975)))

“Oh, `replicate`

must be some new function.” Yeah, new in **R version 1.8, in 2003!**

I’m in serious need of some re-education (e.g., I should be using more of Hadley Wickham’s packages). Hence the beginnings of a tutorial.

Note: the title was suggested by Thomas Lumley. No connection to @hspter; it’s not really so hip. I probably should have written “geeksteR.”

To

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