I tried googling that, but the search engine just ignores the "%" sign and is not giving me meaningful search results. I ended up doing a trial and error and kinda figured out what it does. But I am wondering if there is a good website that shows you all the meanings behind R's commands that involve %%? Thanks! Casper -- View this message in context: http://r.789695.n4.nabble.com/How-to-look-up-explanations-for-in-tp3235274p3235274.html Sent from the R help mailing list archive at Nabble.com.