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Merge branch 'master' of github.com:hadley/r4ds

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hadley
2016-01-12 10:43:13 -06:00
parent 3b71d0a1e4 fd545d0f14
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transform.Rmd
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@@ -394,7 +394,7 @@ This function works similarly to the `select` argument in `base::subset()`. Beca
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### Exericses
### Exercises
1. Brainstorm as many ways as possible to select `dep_time`, `dep_delay`,
`arr_time`, and `arr_delay` from `flights`.
@@ -534,7 +534,7 @@ ggplot(flights, aes(air_time - airtime2)) + geom_histogram()
1. Currently `dep_time()` and `arr_time()` are convenient to look at, but
hard to compute with because they're not really continuous numbers.
Convert them to a more convenient represention of number of minutes
Convert them to a more convenient representation of number of minutes
since midnight.
1. Compute the scheduled time by adding `dep_delay` to `dep_time`. Plot