[R] Iterations

[rkevinburton at charter.net]

I have a command that reads in some data:

x <- read.csv("Sales2007.dat", header=TRUE)

Then I try to organize the data:

sc <- split(x, list(x$Category, x$SubCategory), drop=TRUE)

Then I want to iterate through the data. I was able to get the following to run on the R console:

for(i in 1:length(sc))
{
    sum(sc[[i]]$Quantity)
}

But notiing is primted on the console. I find that:

for(i in 1:100)
{
    i
}

Also does't output anything? I am probably making a wrong assumption here. Why desn't the loop seem to output anyything?

Thank you.

Kevin