Tena koe Nate
You can use the fact that R recycles. If yourData is a dataframe, then (as
examples):
yourData[c(TRUE,FALSE),] will give you every second row, starting with the
first. Similarly,
yourData[c(FALSE,TRUE,FALSE),] will give every third row, starting with the
second; and
yourData[c(TRUE, rep(FALSE,19)),] will give every twentieth row, starting with
the first.
There's also seq().
HTH ....
Peter Alspach.
> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
> project.org] On Behalf Of gibberish
> Sent: Thursday, 23 June 2011 11:05 a.m.
> To: r-help at r-project.org
> Subject: [R] Subsetting data systematically
>
> I would like to subset data from a larger dataset and generate a
> smaller
> dataset. However, I don't want to use sample() because it does it
> randomly.
> I would like to take non-random subsamples, for example, every 2nd
> number,
> or every 3rd number. Is there a procedure that does this?
>
> Thanks, Nate
>
> --
> View this message in context: http://r.789695.n4.nabble.com/Subsetting-
> data-systematically-tp3618516p3618516.html
> Sent from the R help mailing list archive at Nabble.com.
>
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> and provide commented, minimal, self-contained, reproducible code.
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