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

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hadley 2016-08-10 15:56:11 -05:00
parent 9398e03ddf 35d464049f
commit 36c5d3e59d
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2
transform.Rmd
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@ -145,7 +145,7 @@ Whenever you start using complicated, multipart expressions in `filter()`, consi
### Missing values
One important feature of R that can make comparison tricky are missing values, or `NA`s ("not applicables"). `NA` represents an unknown value so missing values are "contagious": almost any operation involving an unknown value will also be unknown.
One important feature of R that can make comparison tricky are missing values, or `NA`s ("not availables"). `NA` represents an unknown value so missing values are "contagious": almost any operation involving an unknown value will also be unknown.
```{r}
NA > 5

2
visualize.Rmd
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@ -249,7 +249,7 @@ ggplot(data = mpg) +
facet_grid(drv ~ cyl)
```
If you prefer to not facet in the rows or columns dimension, use a `.` instead of a variable name, e.g. `+ facet_grid(. ~ clarity)`.
If you prefer to not facet in the rows or columns dimension, use a `.` instead of a variable name, e.g. `+ facet_grid(. ~ cyl)`.
### Exercises