yes you are right .... it was my inattention it is friday and my head needs
to start the week end sorry;-)
2012/6/8 David Winsemius <dwinsem...@comcast.net>
>
> On Jun 8, 2012, at 12:33 PM, Guido Leoni wrote:
>
> Dear list
>> Is there a way to extract a random sample without duplicated row from a
>> dataframe ?.
>> a=c(1,2,3,1,1,1,2,1)
>> b=c(1,2,3,1,2,1,2,1)
>> c=c(1,1,1,1,1,1,1,1)
>> d=c(1,2,3,1,1,1,2,1)
>> prov<-data.frame(a,b,c,d)
>> prov2<-prov[sample(1:nrow(**prov),5,replace=T),]
>> prov2
>> a b c d
>> 3 3 3 1 3
>> 6 1 1 1 1
>> 3.1 3 3 1 3
>> 5 1 2 1 1
>> 8 1 1 1 1
>>
>> I tryed the above code but as you can see sample function includes also
>> duplicates.
>> thank you for any tip
>>
>
> Why would you use replace=T if you didn't want duplicates???
>
> --
>
> David Winsemius, MD
> West Hartford, CT
>
>
--
Guido Leoni
National Research Institute on Food and Nutrition
(I.N.R.A.N.)
via Ardeatina 546
00178 Rome
Italy
tel + 39 06 51 49 41 (operator)
+ 39 06 51 49 4498 (direct)
[[alternative HTML version deleted]]
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
