R: Count unique items in a vector

Had to look this one up, so here it is:

length(unique(x))

Counts the number of distinct items in a vector in R.

This entry was posted on Thursday, March 18th, 2010 at 1:21 pm and is filed under feature, r. You can follow any comments to this entry through the RSS 2.0 feed. Both comments and pings are currently closed.

One comment

  1. Marcus
    June 3, 2013 at 8:33 pm

    Thanks Matt this was helpful.