# Re: [R] problem with function "rep"

From: Julien Hunt <julien.hunt_at_uclouvain.be>
Date: Thu, 12 Jun 2008 17:27:10 +0200

Hi I believe this should provide an example of the confusing behavior.

Run this with t=100 for example:

test=function(t){

x=c()
while(sum(x)<=t){
###I simply generate some numbers from an exponential until the sum of these numbers gets to 100(without loss of generality)
x=c(x,round(rexp(1,0.1),4))
}
x=x/0.0001

y=rnorm(length(x),0,1)
t=rep(y,x)

return(sum(x),length(t))

}

The intuition is that sum(x) and length(t) should be the same. furthermore, rounding x seems since all is done for it to be an integer.
Nevertheless, I will try Berwin Turlach's method. Regards,
Julien

At 17:01 12/06/2008, Erik Iverson wrote:
>We need a reproducible example of this to tell
>you what is going on. Find a small example that
>exhibits the confusing behavior, and share it with the list.
>
>Julien Hunt wrote:
>>To whom it may concern,
>>I am currently writing a program where I need to use function rep.
>>The results I get are quite confusing. Given
>>two vectors A and B, I want to replicate a[1]
>>b[1] times, a[2] b[2] times and so on.
>>All the entries of vector B are positive integers.
>>My problem comes from the fact that if I sum up
>>all the elements of B, I get a certain
>>value x(for example 10000). And if i calculate
>>the length of the vector obtained after
>>replication, I dont always get x(10000) but
>>sometimes I get x sometimes I get 9999 instead of 10000.
>>Has this problem been reported before? Do you
>>Thanks for your time and help,
>>Best regards,
>>Julien Hunt
>>Julien Hunt,
>>PhD student and teaching assistant,
>>Institute of Statistics,
>>Université Catholique de Louvain,
>>Voie du Roman pays 20
>>B-1348 Louvain-La-Neuve,
>>Belgium
>>E-mail: Julien.Hunt_at_uclouvain.be
>>Tel: +32 10 / 47 94 01
>>*****************************************************
>>
>> [[alternative HTML version deleted]]
>>
>>------------------------------------------------------------------------
>>______________________________________________
>>R-help_at_r-project.org mailing list
>>https://stat.ethz.ch/mailman/listinfo/r-help
>>and provide commented, minimal, self-contained, reproducible code.
>
>Julien Hunt,
>PhD student and teaching assistant,
>Institute of Statistics,
>Université Catholique de Louvain,
>Voie du Roman pays 20
>B-1348 Louvain-La-Neuve,
>Belgium
>
>E-mail: Julien.Hunt_at_uclouvain.be
>Tel: +32 10 / 47 94 01
>*****************************************************
>

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