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by Graham Williams
Duck Duck Go


Add a Caption and Label


Figure 22.1: The 3pm temperature for four locations.


Adding a caption (which automatically also adds a label) is done using fig.cap=.

<<myfigure, fig.cap="The 3pm temperature for four locations.", fig.pos="h",...
... R code ...

We have also used (but can't see) fig.pos="h" which requests placement of the figure “here” rather than letting it float. Other options are to place the figure at the top of a page ("t"), or the bottom of a page ("b"). We can leave it empty and the placement is done automatically—that is, the figure floats to an appropriate location.

Once a caption is added, a label is also added to the figure so that it can be referred to in the document. The label is made up of fig: followed by the chunk label, which is myfigure in this example. So we can refer to the figure using \ref{fig:myfigure} and \pageref{fig:myfigure}, which allows us to refer to Figure 22.1 on Page [*].

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