Breaking lines in colnames or rownames

Question

This is an example of a report that I’m doing. As the margin settings are already adjusted, when I change the names of the columns with the colnames it ends up passing the margin. Any help on how to break this line ? For example the "Predicted ARIMA". Will an image of how it could look.

x <- runif(n = 15, min = 1, 10)
y <- runif(n = 15, min = 1, 10)
z <- runif(n = 15, min = 1, 10)
w <- runif(n = 15, min = 1, 10)
k <- runif(n = 15, min = 1, 10)


df_exemplo <- data.frame(x, y, z, w, k)
colnames(df_exemplo) <- c("Previsto ARIMA", "Previsto Holtwinters", "Observado", "Erro ARIMA (%)", "Erro Holtwinters (%)")

Answer 1

I recommend using the package kableExtra to format tables in knitr or sweave. It works in conjunction with the function kable package knitr and the results are very nice. See below:

Follow the code used to create this table:

\documentclass{article}

\usepackage{booktabs}
\usepackage{makecell}

\begin{document}

<<Dados>>=
x <- runif(n = 15, min = 1, 10)
y <- runif(n = 15, min = 1, 10)
z <- runif(n = 15, min = 1, 10)
w <- runif(n = 15, min = 1, 10)
k <- runif(n = 15, min = 1, 10)

df_exemplo <- data.frame(x, y, z, w, k)
colnames(df_exemplo) <- c("Previsto ARIMA", "Previsto Holtwinters", 
                          "Observado", "Erro ARIMA (%)", 
                          "Erro Holtwinters (%)")
@


<<TabelaComQuebra, warning=FALSE>>=
library(knitr)
library(kableExtra)

kable(df_exemplo, "latex", booktabs=TRUE, digits=4) %>%
  column_spec(1:5, width = c("1.5cm", "2cm", "2cm", "2cm", "2.5cm"))
@


\end{document}

Note that I had to load two Latex packets for the table to come out in this format. The line break in the table title exited automatically when using the function column_spec. I just set the width I’d like the column to have and the software did the rest.