r4ds/column-wise.qmd

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# Column-wise operations {#sec-column-wise}
```{r}
#| results: "asis"
#| echo: false
source("_common.R")
status("drafting")
```
## Introduction
<!--# TO DO: Write introduction. -->
### Prerequisites
In this chapter we'll continue using dplyr.
dplyr is a member of the core tidyverse.
```{r}
#| label: setup
#| message: false
library(tidyverse)
```
<!--# TO DO: Write chapter around across, etc. -->