Data Science Desktop Survival Guide by Graham Williams
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Adding a Caption and Reference Label

Raw We have seen captions and labels above but tell the story here in a slightly different way.

print(xtable(ds,
             digits=0,
             caption="Selected observations from \\textbf{weatherAUS}."),
      include.rownames=FALSE)

Table: Selected observations from weatherAUS.

Location	MinTemp	MaxTemp	Rainfall	Evaporation
Tuggeranong	10	25	0
Wollongong	21	31	1
Dartmoor	6	15	2	3
Sale	17	29	0	6
WaggaWagga	8	31	0	4

Notice that we wanted to emphasise the name of the dataset in the caption. We can make it bold using the \textbf{} command of LaTeX within the string passed to caption=. We need to repeat the backslash because R itself will attempt to interpret it otherwise. That is, we escape the backslash.

As well as adding a caption with a table number, we can add a label to the xtable::xtable() command and then refer to the table within the text using the \ref{MyTable} LaTeX command. Thus, in the source document we use “Table~\ref{MyTable}” to produce “Table ” in the documnet.

print(xtable(ds,
             digits=0,
             caption="Selected observations from \\textbf{weatherAUS}.",
             label="MyTable"),
      include.rownames=FALSE)

Table: Selected observations from weatherAUS.

Location	MinTemp	MaxTemp	Rainfall	Evaporation
Tuggeranong	10	25	0
Wollongong	21	31	1
Dartmoor	6	15	2	3
Sale	17	29	0	6
WaggaWagga	8	31	0	4

The references to Table  can appear anywhere in the document. We can even refer to its page number by replacing \ref{MyTable} with \pageref{MyTable} to get Table  on Page .