R: Subsetting a list based on a condition

January 19, 2012
By

(This article was first published on Drunks&Lampposts » R, and kindly contributed to R-bloggers)

Quite a handy couple of lines of code to subset a list in R to just those elements which meet a certain condition. Here’s an example to return only those elements of a list which are a certain class.

Thanks to this StackOverflow answer.


list.condition <- sapply(input.list, function(x) class(x)=="desired.class")
output.list  <- input.list[list.condition]

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