Problem in generate random samples in r

On 20. Feb 2019, at 12:20, Lara Silva <lara.sfp.silva at gmail.com> 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

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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]]

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 <lara.sfp.silva at gmail.com> 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]]