# R Quickie: Custom Panel Functions and Default Arguments

[This article was first published on

Want to share your content on R-bloggers? click here if you have a blog, or here if you don't.

**dylan's blog**, and kindly contributed to R-bloggers]. (You can report issue about the content on this page here)Want to share your content on R-bloggers? click here if you have a blog, or here if you don't.

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.

To

**leave a comment**for the author, please follow the link and comment on their blog:**dylan's blog**.R-bloggers.com offers

**daily e-mail updates**about R news and tutorials about learning R and many other topics. Click here if you're looking to post or find an R/data-science job.

Want to share your content on R-bloggers? click here if you have a blog, or here if you don't.