Changing the graphical theme using trellis.par.set(), as demonstrated in the preceding video, makes the changes permanent, applying to all subsequent plots, until the theme is reset.

If you wish to make changes for a specific plot, an easier alternative is to supply the theme as the optional argument par.settings to a high-level call. In that case, the settings will be associated only to that particular call. In this exercise, you will use this approach to create a dot plot of the WorldPhones data with the ggplot2like() theme.

As we saw earlier, changing the theme alone may be insufficient; we also need to change other things like the spacing between panels. Such settings (which are not considered graphical parameters) can also be customized through a list of "options". To go with the ggplot2like() theme, the latticeExtra package also provides a suitable list of options, produced by ggplot2like.opts().

Options can be associated to a particular plot by specifying it as the lattice.options argument in a high-level call, or set more permanently using the lattice.options() function.