Thanks!


________________________________

	From: Peter Alspach-2 [via R]
[mailto:ml-node+3618799-1094957657-247219@n4.nabble.com] 
	Sent: Wednesday, June 22, 2011 9:27 PM
	To: Bendik, Nathan
	Subject: Re: Subsetting data systematically
	
	
	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: [hidden email] [mailto:r-help-bounces@r- 
	> project.org] On Behalf Of gibberish 
	> Sent: Thursday, 23 June 2011 11:05 a.m. 
	> To: [hidden email] 
	> 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:
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	> and provide commented, minimal, self-contained, reproducible
code. 

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