R help - Sep 2010 - Help with repeating values in a column of dataframe in R on a random pattern- reg

Dear Group
I have to populate a column in a R dataframe containing say 99 rows, where 
for every 3 row one row (randomly determined) of the column should take 
the value 1 and the other 2 row of that column should take the value 0.
I used the command
dataframe$new<-rep(sample(c(0,1,0),3,replace=FALSE),99)
This command repeats the same patter of response across the entire 
column..
I would rather want the response be randomly populated in every set of 3 
rows..
Eg. if the first row of that column has 0 and the second row of that 
column takes a value of 1 and third row of that column takes 0 again,
for the next 3 rows of that column i would want this order differently say 
1,0,0 and so on..
Can anybody help how i can acheive this.
Thanks.
Regards
Vijayan Padmanabhan

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I think you want to use replicate:

replicate(33, sample(c(0,0,1),3))


On Tue, Sep 7, 2010 at 7:37 AM, Vijayan Padmanabhan
<V.Padmanabhan at itc.in> wrote:
>
> Dear Group
> I have to populate a column in a R dataframe containing say 99 rows, where
> for every 3 row one row (randomly determined) of the column should take
> the value 1 and the other 2 row of that column should take the value 0.
> I used the command
> dataframe$new<-rep(sample(c(0,1,0),3,replace=FALSE),99)
> This command repeats the same patter of response across the entire
> column..
> I would rather want the response be randomly populated in every set of 3
> rows..
> Eg. if the first row of that column has 0 and the second row of that
> column takes a value of 1 and third row of that column takes 0 again,
> for the next 3 rows of that column i would want this order differently say
> 1,0,0 and so on..
> Can anybody help how i can acheive this.
> Thanks.
> Regards
> Vijayan Padmanabhan
>
> Can you avoid printing this?
> Think of the environment before printing the email.
>
-------------------------------------------------------------------------------
> Please visit us at www.itcportal.com
>
******************************************************************************
> This Communication is for the exclusive use of the intended recipient (s)
and shall
> not attach any liability on the originator or ITC Ltd./its Subsidiaries/its
Group
> Companies. If you are the addressee, the contents of this email are
intended for your
> use only and it shall not be forwarded to any third party, without first
obtaining
> written authorisation from the originator or ITC Ltd./its Subsidiaries/its
Group
> Companies. It may contain information which is confidential and legally
privileged
> and the same shall not be used or dealt with by any third party in any
manner
> whatsoever without the specific consent of ITC Ltd./its Subsidiaries/its
Group
> Companies.
> ? ? ? ?[[alternative HTML version deleted]]
>
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