I want to put a comment under a table printed out by xtable.
I figured that the best option would be to use the "caption" option: xtable(tablename, caption="This is a caption")
. But this is somehow putting in a "Table 1" automatical开发者_开发技巧ly, so that the output looks like:
Table 1: This is a caption.
Is there any way to suppress this or any simpler way of putting in a comment simply as an additional last row in the table?
First, some mock data:
x <- sample(LETTERS, 5, replace = TRUE)
y <- sample(LETTERS, 5, replace = TRUE)
z <- table(x, y)
Now here's a somewhat clumsy solution, using print.xtable
's add.to.row
argument.
comment <- list()
comment$pos <- list()
comment$pos[[1]] <- c(nrow(z))
comment$command <- c(paste("\\hline \n", # we`ll replace all default hlines with this and the ones below
"your footnote, caption or whatever. \n",
sep = ""))
print(xtable(z),
add.to.row = comment,
hline.after = c(-1, 0)) # indicates rows that will contain hlines (the last one was defined up there)
If you want your comment to be placed before the data, use comment$pos[[1]] <- c(0)
instead of comment$pos[[1]] <- c(nrow(z))
and adjust hline.after
accordingly.
Here's my output:
% latex table generated in R 2.14.1 by xtable 1.7-0 package
% Mon Feb 20 02:17:58 2012
\begin{table}[ht]
\begin{center}
\begin{tabular}{rrrrr}
\hline
& B & C & P & V \\
\hline
A & 0 & 0 & 0 & 1 \\
D & 1 & 0 & 0 & 0 \\
I & 0 & 0 & 0 & 1 \\
P & 0 & 0 & 1 & 0 \\
Z & 0 & 1 & 0 & 0 \\
\hline
your footnote, caption or whatever.
\end{tabular}
\end{center}
\end{table}
This is basically repurposing this answer, but this is the most programmatic way to do this with xtable
. It's ugly, mainly because I hate the way xtable
's add.to.row
argument works.
Sample data:
set.seed(230)
DF <- data.frame(a = rnorm(5), b = rnorm(5), c = rnorm(5))
#of course, we can pass this directly below; I'm just saving
# horizontal space for this answer
comm <- paste0("\\hline \n \\multicolumn{4}{l}",
"{\\scriptsize{Check out these random numbers!}} \n")
print.xtable(xtable(DF, caption = "Describe the table"),
#adjusting hline.after so that our comment appears
# "outside" the table, as defined by its border
hline.after=c(-1, 0),
#**NOTE: the first argument to add.to.row must be
# a list -- don't ask me why since it strikes me as odd**
add.to.row = list(pos = list(5),
command = comm))
Here's the TeX output:
% latex table generated in R 3.2.4 by xtable 1.8-2 package
% Mon May 23 18:25:14 2016
\begin{table}[ht]
\centering
\begin{tabular}{rrrr}
\hline
& a & b & c \\
\hline
1 & -0.23 & 0.04 & 1.34 \\
2 & 0.10 & 0.57 & -1.62 \\
3 & 0.33 & -0.14 & 0.83 \\
4 & 0.36 & -0.75 & 0.20 \\
5 & 0.44 & 0.13 & -0.49 \\
\hline
\multicolumn{4}{l}{\scriptsize{Check out these random numbers!}}
\end{tabular}
\caption{Describe the table}
\end{table}
And the .pdf result if I wrap it with \documentclass{article}
, \begin{document}
, and \end{document}
:
Of course, there are much more bells and whistles to add to get it publication-ready, but this is the crux and you should be well on your way.
If you are using RMarkdown, add this to the header:
---
(other configs here, like title, author, etc.)
header-includes:
- \usepackage{caption}
- \captionsetup{labelformat=empty}
---
Edit:
After talking with xtable package maintainer, David (that was very accessible), he came with this solution I post below:
I think this can be solved with xtableList. Create some data and convert the data frame to xtableList.
set.seed(230)
DF <- data.frame(a = rnorm(5), b = rnorm(5), c = rnorm(5))
library(xtable)
dfList <- list(DF)
attr(dfList, "message") <- c("A caption", "Which can have multiple lines")
Then xtable produces the following:
print(xtableList(dfList))
## % latex table generated in R 3.2.5 by xtable 1.8-3 package
## % Sat Jul 09 21:52:53 2016
## \begin{table}[ht]
## \centering
## \begin{tabular}{rrrr}
## \hline
## & a & b & c \\
## \hline
## 1 & -0.23 & 0.04 & 1.34 \\
## 2 & 0.10 & 0.57 & -1.62 \\
## 3 & 0.33 & -0.14 & 0.83 \\
## 4 & 0.36 & -0.75 & 0.20 \\
## 5 & 0.44 & 0.13 & -0.49 \\
## \hline
## \multicolumn{4}{l}{A caption}\\
##
## \multicolumn{4}{l}{Which can have multiple lines}\\
## \end{tabular}
## \end{table}
To deal with long captions you will need to split lines:
attr(dfList, "message") <- c("A caption", "Which can have", "multiple lines")
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