Thanks Jim!
--- On Tue, 12/7/10, jim holtman wrote:
From: jim holtman
Subject: Re: [R] Help on loops
To: "Anup Nandialath"
Cc: r-help@r-project.org
Date: Tuesday, December 7, 2010, 7:47 PM
use split and lapply to make it easier. Substitute in your own
calculations since this
use split and lapply to make it easier. Substitute in your own
calculations since this is just an example:
> x
id t X1 X2
1 1 1 4 3
2 1 2 9 2
3 1 3 7 3
4 1 4 6 6
5 2 1 6 4
6 2 2 5 3
7 2 3 1 1
8 3 1 9 6
9 3 2 5 5
> # first split the data by 'id'
> x.s <- split(x, x$id)
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