[R] how to pass defined function with more than one arguments to apply?

Dear all: I meet a problem of apply function. I have a matrix called tb tb V1 V2 V3 1 0 3 1 2 1 4 0 3 0 3 0 4 0 4 0 5 0 3 1 6 1 4 1 7 1 1 0 8 1 3 0 9 0 1 1 10 0 3 1 I hope to get the number of row that match c(0,3,1) I do this way: length(apply(t(tb) = =

Re: [R] how to pass defined function with more than one arguments to apply?

Hi! ?apply ...: optional arguments to 'FUN'. you can pass more arguments to your function. length(apply(tb,comare,c(0,3,1))) Sincerely Eryk. *** REPLY SEPARATOR *** On 5/28/2004 at 12:05 PM anoly wrote: Dear all: I meet a problem of apply function. I have a matrix called tb

Re: [R] how to pass defined function with more than one arguments to apply?

Not sure what you intend with regard to length but to get a logical vector indicating which rows equal a particular vector: f1 - function(tb, row) apply(tb,1,function(x)all(x==row)) # or without using apply: f2 - function(tb, row) colSums( abs( (t(tb) - row) ) ) == 0 # or in terms of a