From: Adrian DUSA <dusa.adrian_at_gmail.com>

Date: Tue 30 Jan 2007 - 14:29:15 GMT

Date: Tue 30 Jan 2007 - 14:29:15 GMT

Dear list,

This should be a simple one, I just cannot see it. I need to generate a sequence of the form: 4 5 6 13 14 15 22 23 24

That is: starting with 4, make a 3 numbers sequence, jump 6, then another 3
and so on.

I can create a whole vector with:

myvec <- rep(rep(c(F, T, F), rep(3, 3)), 3)

Then see which are TRUE:

which(myvec)

[1] 4 5 6 13 14 15 22 23 24

I'd like to avoid creating the whole vector if possible; for very large ones it can be time consuming. There should be a way to only create the proper indexes...

Thanks for any hint,

Adrian

-- Adrian Dusa Romanian Social Data Archive 1, Schitu Magureanu Bd 050025 Bucharest sector 5 Romania Tel./Fax: +40 21 3126618 \ +40 21 3120210 / int.101 ______________________________________________ R-help@stat.math.ethz.ch mailing list 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 Wed Jan 31 01:35:07 2007

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