## Sunday, November 19, 2017

### Automatic output format in Rmarkdown

I am writing a Rmarkdown document with plenty of tables, and I want them in a decent format, e.g. kable. However I don't want to format them one by one. For example, I have created the following data frame in dplyr

data2 %>% group_by(uf) %>%
summarise(n = n(), ) %>%
arrange(desc(n))

One solution to the output format of this data frame would be to name it as an object in R, and then give it a format by using the kable function.

t1 <- data2 %>%
group_by(uf) %>%
summarise(n = n(), ) %>% arrange(desc(n))

knitr::kable(t1)

However, if your document has hundreds of these queries and you need a faster way to compile the document, while keeping the kable style automatically, avoiding giving a name to the data frame and even avoiding to call the kable function over that name, you can use the printr package. Just add the following piece of code inside a chunk at the beginning of your document and voilá.

library(printr)

Now, all of your data frames will have a decent style, and you do not need to worry about this issue. For example, I have knitted a presentation by using printr and the first code in this post, and this is the result: