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

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hadley 2016-08-19 14:42:50 -05:00
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pipes.Rmd
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@ -56,7 +56,7 @@ The main downside of this form is that it forces you to name each intermediate e
Whenever I write code like this, I invariably use the wrong number on one line and then spend 10 minutes scratching my head and trying to figure out what went wrong with my code. Whenever I write code like this, I invariably use the wrong number on one line and then spend 10 minutes scratching my head and trying to figure out what went wrong with my code.
You may also worry that this form creates many copies of your data and takes up a lot of memory. Suprisingly, that's not the case. First, note that proactively worrying about memory is not a useful way to spend your time: worry about it when it becomes a problem (i.e. you run out of memory), not before. Second, R isn't stupid, and it will share columns across data frames, where possible. Let's take a look at an actual data manipulation pipeline where we add a new column to `ggplot2::diamonds`: You may also worry that this form creates many copies of your data and takes up a lot of memory. Surprisingly, that's not the case. First, note that proactively worrying about memory is not a useful way to spend your time: worry about it when it becomes a problem (i.e. you run out of memory), not before. Second, R isn't stupid, and it will share columns across data frames, where possible. Let's take a look at an actual data manipulation pipeline where we add a new column to `ggplot2::diamonds`:
```{r} ```{r}
diamonds <- ggplot2::diamonds diamonds <- ggplot2::diamonds
@ -208,7 +208,7 @@ The pipe is a powerful tool, but it's not the only tool at your disposal, and it
## Other tools from magrittr ## Other tools from magrittr
All packages in the tidyverse automatically make `%>%` alivaiable for you, so you don't normally load magrittr explicitly. However, there are some other useful tools inside magrittr that you might want to try out: All packages in the tidyverse automatically make `%>%` available for you, so you don't normally load magrittr explicitly. However, there are some other useful tools inside magrittr that you might want to try out:
* When working with more complex pipes, it's sometimes useful to call a * When working with more complex pipes, it's sometimes useful to call a
function for its side-effects. Maybe you want to print out the current function for its side-effects. Maybe you want to print out the current