add example script to intro to R lesson (fixes issue #74)

datacarpentry / R-genomics

Lesson on data analysis and visualization in R for genomics

http://datacarpentry.github.io/R-genomics

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Open alanaschick opened 5 years ago

alanaschick commented 5 years ago

Added an example script that was missing from the Intro to R episode. Also removed the $ operator from this section (covered later in data frames).