Data Science Desktop Survival Guide by Graham Williams
Desktop Survival Project Home Preface Data Science Introducing R R Constructs R Tasks R Strings R Read, Write, and Create Data Template Data Exploration Data Wrangling Data Visualisation Statistics ML Template ML Scenarios ML Activities ML Applications ML Algorithms Cluster Analysis Decision Trees Computer Vision Graph Data Privacy Literate Data Science Coding with Style Resources Bibliography Index

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Add a Caption and Label

Raw

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 .