What does "not run" mean in R help pages?

Question

Sometimes on an R help page the phrase "not run" appears in comments. Check out this from the help page for "with()": Examples require(stats); require(graphics) #examples from glm: **## Not run:** library(MASS) with(anorexia, { anorex.1 <- glm(Postwt ~ Prewt + Treat + offset(Prewt), family = gaussian) summary(anorex.1) }) ## End(**Not run**)What does the "not run" mean in the example code?

Answer 1

All that this means is that developer included an example, but for the purposes of having the package put on CRAN or some other large repository, they added that comment so that the example would not be run during testing.