Conditional Colors and Shapes in plot() with ifelse()

October 9, 2012
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(This article was first published on is.R(), and kindly contributed to R-bloggers)

Here’s an example of how to color your plot shapes and pch using an ifelse() statement. Ifelse() is handy as it creates an easy way to branch a function. The syntax is: ifelse(logical.condition, option1, option2). Meaning, if the logical condition is met, use option 1, otherwise do option 2. Obviously this is a simple example of when to use it, but it might be helpful.

The plot my code produces can be seen here (yours may be different based on your version of R or the random number seed you have set). I’d bet that if you run the code an infinite number of times, it will eventually look exactly like mine.

Code can be found here:

To leave a comment for the author, please follow the link and comment on his blog: is.R().

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