[R] expand the inside of command with rep ?

[Greg Snow]

Something like this:

> do.call( cbind, rep(list(1:10), 5) )
      [,1] [,2] [,3] [,4] [,5]
 [1,]    1    1    1    1    1
 [2,]    2    2    2    2    2
 [3,]    3    3    3    3    3
 [4,]    4    4    4    4    4
 [5,]    5    5    5    5    5
 [6,]    6    6    6    6    6
 [7,]    7    7    7    7    7
 [8,]    8    8    8    8    8
 [9,]    9    9    9    9    9
[10,]   10   10   10   10   10

Hope this helps,

-- 
Gregory (Greg) L. Snow Ph.D.
Statistical Data Center
Intermountain Healthcare
greg.snow at imail.org
801.408.8111


> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
> project.org] On Behalf Of Xu Wang
> Sent: Wednesday, February 10, 2010 1:28 PM
> To: r-help at r-project.org
> Subject: [R] expand the inside of command with rep ?
> 
> 
> Hi,
> 
> I would like to be able to repeat a string within a command. I think
> there
> is an easy way but I can not figure out how.
> 
> Here is an example.
> 
> x<-1:15
> I would like to turn this into the following matrix:
> xm<-cbind(x,x,x,x,x)
> 
> But I would like to do so by having a command that repeats x within the
> cbind command. Does that make sense? I have tried various things mainly
> involving the commands "rep" and "paste" but cannot get it.
> 
> cbind(rep('x',times=5))
> 
> I am guessing that this is not good programming etiquette? Something
> seems
> off about it. But still, I would like to know how to do it.
> 
> I do understand that I can use a for loop to easily accomplish the
> desired
> output but am looking for a solution similar to the above syntax.
> 
> Thank you for any ideas,
> 
> Xu Wang
> --
> View this message in context: http://n4.nabble.com/expand-the-inside-
> of-command-with-rep-tp1476420p1476420.html
> Sent from the R help mailing list archive at Nabble.com.
> 
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