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if (interactive() || is.na(Sys.getenv('NOT_CRAN', unset = NA)) ) {
# Chapter 1 - Introducing R: The Big Picture
# Recognizing the Benefits of Using R
## It comes as free, open-source code
### It runs anywhere
### It supports extensions
### It provides an engaged community
### It connects with other languages
# Looking At Some of the Unique Features of R
## Performing multiple calculations with vectors
x <- 1:5
x
x + 2
x + 6:10
## Processing more than just statistics
## Running code without a compiler
}
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