Re: [R] Iterations

From: Stephan Kolassa <Stephan.Kolassa_at_gmx.de>
Date: Tue, 15 Jul 2008 19:37:11 +0200

Kevin,

By default, many functions only *return* a result, they don't explicitly *print* it. There is no difference in interactive mode, but there is in batch mode (e.g., in loops). Use print() or cat() for explicit printing to console.

for(i in 1:100)
{

     cat(i,"\n")
}

HTH,
Stephan

rkevinburton_at_charter.net schrieb:
> 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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>



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https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. Received on Tue 15 Jul 2008 - 17:46:51 GMT

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