adding \label{} in kable kableExtra latex output

Question

I am trying to create a latex formatted table in R with a \label{} option.

Something similar to

library(tidyverse)
library(knitr)
library(kableExtra)

data_frame(a = 1:3, b = 2:4) %>% 
  kable(align = 'c', format = 'latex') %>% 
  kable_styling(full_width = FALSE)

the resulting output is below, but i would like to add the \label{label_value} parameter to the latex table with a label_value I can define

\begin{table}[H]
\centering
\begin{tabular}{c|c}
\hline
a & b\\
\hline
1 & 2\\
\hline
2 & 3\\
\hline
3 & 4\\
\hline
\end{tabular}
\end{table}

I am trying to automatically create tables in R which I can save and then include in a latex document

Answer 1

If you put a caption in the call to kable, you'll get a label automatically, based on the name you give to the code chunk.
If you are running it at the top level as in your example, it's kind of clunky: you need put the label in your caption, and you'll get two labels, yours and the auto-generated useless one. For example,

library(tidyverse)
library(knitr)
library(kableExtra)

data_frame(a = 1:3, b = 2:4) %>% 
  kable(align = 'c', format = 'latex', 
       caption = "Table caption \\label{tab:example}") %>% 
  kable_styling(full_width = FALSE)

which produces

\begin{table}[t]

\caption{\label{tab:}Table caption \label{tab:example}}
\centering
\begin{tabular}{c|c}
\hline
a & b\\
\hline
1 & 2\\
\hline
2 & 3\\
\hline
3 & 4\\
\hline
\end{tabular}
\end{table}

I'm not sure, but I'd expect in some circumstances you'd need to manually edit out the auto-generated label \label{tab:}. So use knitr or R-markdown and avoid the problem.

Answer 2

You can use knitr::opts_current to control the automatic label generated with the caption:

> library(knitr)
> library(kableExtra)
> opts_current$set(label = "hello")
> data.frame(a = 1:3, b = 2:4) %>% 
+     kable(align = 'c', format = 'latex', 
+           caption = "Table caption") %>% 
+     kable_styling(full_width = FALSE)
\begin{table}

\caption{\label{tab:hello}Table caption}
\centering
\begin{tabular}[t]{c|c}
\hline
a & b\\
\hline
1 & 2\\
\hline
2 & 3\\
\hline
3 & 4\\
\hline
\end{tabular}
\end{table}

Answer 3

There's a built-in option for that.

kable(..., label = "something")

More info at: https://github.com/haozhu233/kableExtra/issues/486