[R] Problem with data frame

[Gavin Simpson]

On Mon, 2006-04-24 at 14:45 +0530, Arun Kumar Saha wrote:
> 
> I tried with following code:
> 
> >n=20
> random = data.frame(n)
> for ( i in 2: length)
>    {
>     random[,i] = random(500,mean=0,sd=i)
>    }
> 
> but while executing this I am getting errors.

Did you check what you'd done above, or is what you posted not copied
and pasted directly from your R session (and therefore contains typos)?

      * data.frame(n) - doesn't make sense; you have data frame with one
        row/column containing the number 20
      * What is length?
      * If you want i=1,2,.......,n, why do you use "i in 2: length"?
      * What is random() [the function you are trying to use]?
      * What are the error messages - although one can have a good guess
        if you actually tried to run that code. You are asked by the
        posting guide to supply.

Does this help:

ran <- matrix(ncol = 20, nrow = 500)
for (i in 1:20)
{
  ran[, i] <- rnorm(500, sd = i)
}
ran <- as.data.frame(ran)

G

> 
> Can anyone give me any suggestion?
> Thanks and  regards
> Arun
> 
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Gavin Simpson                 
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