[R] Iterations

From: <rkevinburton_at_charter.net>
Date: Tue, 15 Jul 2008 10:11:50 -0700


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



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