[R] Problems with randomly generating samples

(Ted Harding) Ted.Harding at manchester.ac.uk
Wed May 13 17:46:09 CEST 2009

On 13-May-09 15:18:05, Debbie Zhang wrote:
> Dear R users,
> Can anyone please tell me how to generate a large number of samples in
> R, given certain distribution and size.
> For example, if I want to generate 1000 samples of size n=100, with a
> N(0,1) distribution, how should I proceed? 
> (Since I dont want to do "rnorm(100,0,1)" in R for 1000 times)
> Thanks for help
> Debbie

One possibility is

  nsamples <- 1000
  sampsize <- 100
  Samples <- matrix(rnorm(nsamples*sampsize,0,1),nrow=nsamples)

Then each row of the matrix Samples will be a sample of size 'sampsize',
the i-th can be accessed as Samples[i,], and there are 'nsamples' rows
to choose from.


E-Mail: (Ted Harding) <Ted.Harding at manchester.ac.uk>
Fax-to-email: +44 (0)870 094 0861
Date: 13-May-09                                       Time: 16:46:05
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