R Quickie: Custom Panel Functions and Default Arguments
Sometimes the basic functionality in lattice graphics isn’t enough. Custom “panel functions” are one approach to fully customizing the lattice graphics system. Two examples are given below illustrating how to define an (inline) custom panel function for adding a regression line to an entire data set in the presence of grouping variable. The “…” keyword instructs our custom panel function to accept all arguments typically passed to a panel function, and can be re-used in clever ways within our panel function.
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