[R] Simulation
Barry Rowlingson
b.rowlingson at lancaster.ac.uk
Wed May 13 17:45:22 CEST 2009
On Wed, May 13, 2009 at 4:26 PM, Gábor Csárdi <csardi at rmki.kfki.hu> wrote:
> On Wed, May 13, 2009 at 5:13 PM, Debbie Zhang <debbie0621 at hotmail.com> 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)
>
> Why not? It took 0.05 seconds on my 5 years old laptop.
Second-guessing the user, I think she maybe doesn't want to type in
'rnorm(100,0,1)' 1000 times...
Soln - "for" loop:
> z=list()
> for(i in 1:1000){z[[i]]=rnorm(100,0,1)}
now inspect the individual bits:
> hist(z[[1]])
> hist(z[[545]])
If that's the problem, then I suggest she reads an introduction to R...
Barry
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