[R] random sequence

[status at quo.org]

Hi Barbara,

You could use:

samples = matrix(rep(0,(5000*40)),ncol=40)
for(i in 1:5000) {
    samples[i,] = sample(1:40,40)
}

This will give you a matrix of samples, one per row. The second term in
the "sample" function is the length of your sequence. By default "sample"
samples without replacement, so there won't be any duplicates.

The "for" loop is generally slower than using "lapply", but for just 5000
samples it won't make much difference.

Cheers,

Matt Asher
StatisticsBlog.com




> I have a sequence of number from 1 to 40 and I have to extract a random
> sequence, for example:
> 1) 1, 2 3, 4, ...40
> 2) 2, 10, 9 , 25....
>
> e so on for 5000 times. How I can do????
> Thanks
> 	[[alternative HTML version deleted]]
>
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