[R] how to create many variables at one time?

[David Winsemius]

You can also change the column names to something else en mass:

colnames(dat) <- paste("X",1:100,sep="")

I next tried constructing the X<n> names inside data.frame, but failed  
using the paste function. The help page for data.frame has a paragraph  
that begins "How the names of the data frame are created is complex..."

At least the following will result in names of the form X.1, X.2 ...

dat <- data.frame( X = replicate(100, rnorm(10)) )

-- 
David Winsemius
On Mar 4, 2009, at 4:44 PM, Kingsford Jones wrote:

> On Wed, Mar 4, 2009 at 2:34 PM, Manli Yan <manliyanrhelp at gmail.com>  
> wrote:
>>  Hi:
>>  I need to create many variables at one time,how to do this in R?
>>  for eg ,X1,X2.......X100?
>
> It depends what you want.  If you want 100 random normal variables of
> length 10, stored in a data.frame with names V1, V2, ..., V100 try
>
> dat <- as.data.frame(replicate(100, rnorm(10)))
>
>
> hth,
> Kingsford Jones
>
>>
>>  Thanks~
>>
>>        [[alternative HTML version deleted]]
>>
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>>
>
> ______________________________________________
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> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.