course/r4ds
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Adjust .value sentinel explanation

Browse Source
This commit is contained in:
Hadley Wickham
2022-03-21 10:57:16 -05:00
parent 005969424e
commit c168835260
1 changed files with 3 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

7
data-tidy.Rmd
View File

@@ -334,10 +334,9 @@ household
``` ```
This dataset contains data about five families, with the names and dates of birth of up to two children. This dataset contains data about five families, with the names and dates of birth of up to two children.
The new challenge in this dataset is that the column names contain both the name of variable (`dob`, `name)` and the value of a variable (`child1`, `child2`). The new challenge in this dataset is that the column names contain the name of two variables (`dob`, `name)` and the values of another (`child,` with values 1 and 2).
We again we need to supply a vector to `names_to` but this time we use the special `".value"`[^data-tidy-1] to indicate that first component of the column name is in fact a variable name. We again we need to supply a vector to `names_to` but this time we use the special `".value"` sentinel.
This overrides the usual `values_to` argument and keeps the first component of the column name as a variable name.
[^data-tidy-1]: Calling this `.value` instead of `.variable` seems confusing so I think we'll change it: <https://github.com/tidyverse/tidyr/issues/1326>
```{r} ```{r}
household |> household |>