R help - Nov 2009 - help sample from large dataset - misleading error?

Hi All,

 

I want to take a simple random sample from a large dataset, gly, but I'm
getting an error message.  Any help?

 

dim(gly)

[1] 112371     37
> s1 <- sample(gly,100)
Error in `[.data.frame`(x, .Internal(sample(length(x), size, replace,  :


  cannot take a sample larger than the population when 'replace = FALSE'

 

Thanks,

 

Rachel


	[[alternative HTML version deleted]]

Rachel,

The first thing to do when a function gives you trouble is
to look at its help page. In the case of sample(), you will
find that it requires a *vector* input. Is your gly a vector?

  -Peter Ehlers

Hayes, Rachel M wrote:
> Hi All,
> 
>  
> 
> I want to take a simple random sample from a large dataset, gly, but
I'm
> getting an error message.  Any help?
> 
>  
> 
> dim(gly)
> 
> [1] 112371     37
> 
>> s1 <- sample(gly,100)
> 
> Error in `[.data.frame`(x, .Internal(sample(length(x), size, replace,  :
> 
> 
>   cannot take a sample larger than the population when 'replace =
FALSE'
> 
>  
> 
> Thanks,
> 
>  
> 
> Rachel
> 
> 
> 	[[alternative HTML version deleted]]
> 
> ______________________________________________
> R-help at r-project.org 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.
> 
>

Hi Rachel,

Here is a suggestion:

index <- sample(100)
mysample <- gly[index, ]
mysample

See ?sample for more information.

HTH,
Jorge


On Fri, Nov 13, 2009 at 5:20 PM, Hayes, Rachel M <> wrote:
> Hi All,
>
>
>
> I want to take a simple random sample from a large dataset, gly, but
I'm
> getting an error message.  Any help?
>
>
>
> dim(gly)
>
> [1] 112371     37
>
> > s1 <- sample(gly,100)
>
> Error in `[.data.frame`(x, .Internal(sample(length(x), size, replace,  :
>
>
>  cannot take a sample larger than the population when 'replace =
FALSE'
>
>
>
> Thanks,
>
>
>
> Rachel
>
>
>        [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
>
http://www.R-project.org/posting-guide.html<http://www.r-project.org/posting-guide.html>
> and provide commented, minimal, self-contained, reproducible code.
>
	[[alternative HTML version deleted]]