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.
--
Witold Eryk Wolski
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