You missed FAQ 7.22

 7.22 Why do lattice/trellis graphics not work?

The most likely reason is that you forgot to tell R to display the graph.
Lattice functions such as xyplot() create a graph object, but do not display
it (the same is true of *ggplot2* graphics, and Trellis graphics in S-Plus).
The print() method for the graph object produces the actual display. When
you use these functions interactively at the command line, the result is
automatically printed, but in source() or inside your own functions you will
need an explicit print() statement.

The FAQ on R and the separate FAQ on R for Windows are both accessible from
the Help menu item on the R Console on the R GUI.

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