Hi - I'm trying to avoid using a 'for' loop due to inefficiency and instead use
a function (and ultimately tapply as I'm working on a matrix) but I can't
figure out how to get 'function' to take the variables as anything other than
vectors for example
aa<-0
x<-1:4
test.fun<-function(x)
{aa<-(x*x +aa)
return(aa)}
test.fun(1:4)
This code returns 'aa' as 1 4 9 16, but I'd like it to return aa as 1 5 14 30
taking into consideration that I've just calculated aa for x=1. Aside from
using loops, is there not a simple way of telling R to work out x for
consecutive values?
thanks
Paul Chatfield
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