[R] List of occurrence matrices

R users, I don't know if I can make myself clear but I'll give it a try. I have a data.frame like this x - var1,var2,var3,var4 a,b,b,a b,b,c,b c,a,a,a a,b,c,c b,a,c,a c,c,b,b a,c,a,b b,c,a,c c,a,b,c DF - read.table(textConnection(x), header=T, sep=,) DF and I would like to sum all the

Re: [R] List of occurrence matrices

Lauri Nikkinen wrote: R users, I don't know if I can make myself clear but I'll give it a try. I have a data.frame like this x - var1,var2,var3,var4 a,b,b,a b,b,c,b c,a,a,a a,b,c,c b,a,c,a c,c,b,b a,c,a,b b,c,a,c c,a,b,c DF - read.table(textConnection(x), header=T, sep=,)

Re: [R] List of occurrence matrices

Tr this: inner - function(a,b,f) apply(b,2,function(x)apply(a,2,function(y)f(x,y))) lapply(levels(DF[, 1]), function(x) inner(DF, DF, function(a, b) sum(a == x b == x))) On Thu, Aug 7, 2008 at 9:04 AM, Lauri Nikkinen [EMAIL PROTECTED] wrote: R users, I don't know if I can make