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The 3pm temperature for four locations.
Adding a caption (which automatically also adds a label) is done using
<<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
this example. So we can refer to the figure using
allows us to refer to Figure 22.1 on
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