Hello,
Try using ?cut
y2 <- cut(x, breaks)
by(x, y2, sum)
Hope this helps,
Rui Barradas
Em 27-06-2013 09:24, Witold E Wolski escreveu:
Is there a build in function to create an index for tapply or by given a
a numeric vector x an a vector of breaks?
What I want to do is:
x <- 1:100
breaks <- c(0,10,20,50,99,110)
y <- rep(0,length(x))
for(i in 2:length(breaks)){
y[which(x>breaks[i-1] & x <= breaks[i])] <- i
}
by(x,y,sum)
but I find the code especially th for loop unneRving.
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