Re: [R-sig-eco] Problem in generate random samples in r

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Re: [R-sig-eco] Problem in generate random samples in r

Pereira
Thanks!

Lara

Henrik Eckermann <[hidden email]> escreveu no dia quarta,
20/02/2019 à(s) 10:25:

> Hi Lara,
>
> the error is quite informative. You use the sample function twice. At
> least for one the length of the vector where you sample from is shorter
> (contains less values) than than the number of samples you wanna draw.
>
> best,
>
> Henrik
>
> > On 20. Feb 2019, at 12:20, Lara Silva <[hidden email]> wrote:
> >
> > Hello,
> >
> > I am trying to generate random samples from the following code
> >
> > ### Setting random seed to always create the same
> > ### Random set of points
> > set.seed(0)
> >
> > absences_15000<-absences[sample(nrow(absences), 15000),]
> > points(absences_15000, cex=0.1)
> >
> > ## Subsample_10000
> > set.seed(0)
> >
> > absences_10000<-absences_15000[sample(nrow(absences_15000), 10000),]
> > dim(absences_10000)
> >
> > I get the following error:
> >
> > Error in sample.int(length(x), size, replace, prob) :
> >  cannot take a sample larger than the population when 'replace = FALSE'
> >
> > Any advice?
> >
> > Regards,
> >
> > Lara
> >
> >       [[alternative HTML version deleted]]
> >
> > _______________________________________________
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> > [hidden email]
> > https://stat.ethz.ch/mailman/listinfo/r-sig-ecology
>
>

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