Hi Marion,

Try this:

set.seed(123)
mydf=data.frame(trips=rpois(10,5), matrix(rnorm(10*5),ncol=5))
mydf
sapply(mydf[,-1],rep,mydf[,1])


HTH,

Jorge


On Wed, May 7, 2008 at 11:41 PM, <mwittmann@bren.ucsb.edu> wrote:

>
>
> Hi,
>
>  I have a data matrix in which there are 1000 rows by 30 columns. The
> first
> column of each row is a numeric indicating the number of trips taken to a
> particular location with location attributes in the following column
> entries for
> that row.
>
> I want to repeat each row based on the number of trips taken (as indicated
> by
> the number in the first column)...i.e., if 1,1 indicates 4 trips, I want
> to
> replicate row 1 four times, and do this for each entry of column 1.
>
> I have played with rep command with little luck. Can anyone help? This is
> probably very simple.
>
> Thank you,
>
> mw
>
>
> Marion Wittmann, Ph.D. candidate
> Environmental Science and Management
> University of California
> Santa Barbara, CA 93106-5131
>
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