Hello, Just look at your second 'apply': the 'function(x)' is not using the 'x' (!) Solution: function(x) hist(x, breaks=0:nrow(test), plot=FALSE)$counts) Note that instead of 'nrow' you could also use 'length(x)'. Hope this helps, Rui Barradas -- View this message in context: http://r.789695.n4.nabble.com/counts-tp4409804p4410888.html Sent from the R help mailing list archive at Nabble.com.