Sample on dataframe

[Jarekj]

Hi
I'm looking for solution or function which I can use to sample data
frame, to obtain new (smaller) data frame similar to sample() function
Jarek Jasiewicz

______________________________________________
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.

[milton ruser]

I hope this helps




my.df<-read.table(stdin(), head=T, sep=" ")
V5 V5.1 V5.2 V5.3 V5.4 V5.5
-5890.18905 -6019.84665 -6211.06545 -6198.9353 -6616.8677 -6498.7183
-5890.18905 -6019.84665 -6211.06545 -6198.9353 -6616.8677 -6498.7183
-5890.18905 -6019.84665 -6211.06545 -6198.9353 -6616.8677 -6498.7183
-5890.18905 -6019.84665 -6211.06545 -6198.9353 -6616.8677 -6498.7183
-5890.18905 -6019.84665 -6211.06545 -6198.9353 -6616.8677 -6498.7183
-5890.18905 -6019.84665 -6211.06545 -6198.9353 -6616.8677 -6498.7183
-5890.18905 -6019.84665 -6211.06545 -6198.9353 -6616.8677 -6498.7183
-5890.18905 -6019.84665 -6211.06545 -6198.9353 -6616.8677 -6498.7183
-5890.18905 -6019.84665 -6211.06545 -6198.9353 -6616.8677 -6498.7183
-5890.18905 -6019.84665 -6211.06545 -6198.9353 -6616.8677 -6498.7183

number.of.records<-5
my.df.subset<-my.df[sample(1:dim(my.df)[1], size=number.of.records,
replace=F),]
my.df.subset
You can change "replace" by T if you allow repeat rows.

Cheers,

miltinho astronauta
brazil





On 7/23/08, Jarekj <jarekj@...> wrote:

>
> Hi
> I'm looking for solution or function which I can use to sample data frame,
> to obtain new (smaller) data frame similar to sample() function
> Jarek Jasiewicz
>
> ______________________________________________
> R-help@... mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html<http://www.r-project.org/posting-guide.html>
> and provide commented, minimal, self-contained, reproducible code.
>

        [[alternative HTML version deleted]]

______________________________________________
R-help@... 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.

[Prof Brian Ripley]

All that is needed is

my.df[sample(nrow(my.df), size=<whatever>), ]

On Wed, 23 Jul 2008, milton ruser wrote:

> I hope this helps
>
>
>
>
> my.df<-read.table(stdin(), head=T, sep=" ")
> V5 V5.1 V5.2 V5.3 V5.4 V5.5
> -5890.18905 -6019.84665 -6211.06545 -6198.9353 -6616.8677 -6498.7183
> -5890.18905 -6019.84665 -6211.06545 -6198.9353 -6616.8677 -6498.7183
> -5890.18905 -6019.84665 -6211.06545 -6198.9353 -6616.8677 -6498.7183
> -5890.18905 -6019.84665 -6211.06545 -6198.9353 -6616.8677 -6498.7183
> -5890.18905 -6019.84665 -6211.06545 -6198.9353 -6616.8677 -6498.7183
> -5890.18905 -6019.84665 -6211.06545 -6198.9353 -6616.8677 -6498.7183
> -5890.18905 -6019.84665 -6211.06545 -6198.9353 -6616.8677 -6498.7183
> -5890.18905 -6019.84665 -6211.06545 -6198.9353 -6616.8677 -6498.7183
> -5890.18905 -6019.84665 -6211.06545 -6198.9353 -6616.8677 -6498.7183
> -5890.18905 -6019.84665 -6211.06545 -6198.9353 -6616.8677 -6498.7183
>
> number.of.records<-5
> my.df.subset<-my.df[sample(1:dim(my.df)[1], size=number.of.records,
> replace=F),]
> my.df.subset
> You can change "replace" by T if you allow repeat rows.
>
> Cheers,
>
> miltinho astronauta
> brazil
>
>
>
>
>
> On 7/23/08, Jarekj <jarekj@...> wrote:
>>
>> Hi
>> I'm looking for solution or function which I can use to sample data frame,
>> to obtain new (smaller) data frame similar to sample() function
>> Jarek Jasiewicz
>>
>> ______________________________________________
>> R-help@... mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide
>> http://www.R-project.org/posting-guide.html<http://www.r-project.org/posting-guide.html>
>> and provide commented, minimal, self-contained, reproducible code.
>>
>
> [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help@... 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.
>

--
Brian D. Ripley,                  ripley@...
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  [phone] (self)
1 South Parks Road,                     [phone] (PA)
Oxford OX1 3TG, UK                Fax:  [phone]

______________________________________________
R-help@... 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.

[Jarekj]

yes, that is
thanks

milton ruser pisze:

> I hope this helps
>  
>
>  
>
> my.df<-read.table(stdin(), head=T, sep=" ")
> V5 V5.1 V5.2 V5.3 V5.4 V5.5
> -5890.18905 -6019.84665 -6211.06545 -6198.9353 -6616.8677 -6498.7183
> -5890.18905 -6019.84665 -6211.06545 -6198.9353 -6616.8677 -6498.7183
> -5890.18905 -6019.84665 -6211.06545 -6198.9353 -6616.8677 -6498.7183
> -5890.18905 -6019.84665 -6211.06545 -6198.9353 -6616.8677 -6498.7183
> -5890.18905 -6019.84665 -6211.06545 -6198.9353 -6616.8677 -6498.7183
> -5890.18905 -6019.84665 -6211.06545 -6198.9353 -6616.8677 -6498.7183
> -5890.18905 -6019.84665 -6211.06545 -6198.9353 -6616.8677 -6498.7183
> -5890.18905 -6019.84665 -6211.06545 -6198.9353 -6616.8677 -6498.7183
> -5890.18905 -6019.84665 -6211.06545 -6198.9353 -6616.8677 -6498.7183
> -5890.18905 -6019.84665 -6211.06545 -6198.9353 -6616.8677 -6498.7183
>
> number.of.records<-5
> my.df.subset<-my.df[sample(1:dim(my.df)[1], size=number.of.records,
> replace=F),]
> my.df.subset
>
> You can change "replace" by T if you allow repeat rows.
>  
> Cheers,
>  
> miltinho astronauta
> brazil
>
>  
>
>
>
>  
> On 7/23/08, *Jarekj* <jarekj@... <mailto:jarekj@...>>
> wrote:
>
>     Hi
>     I'm looking for solution or function which I can use to sample
>     data frame, to obtain new (smaller) data frame similar to sample()
>     function
>     Jarek Jasiewicz
>
>     ______________________________________________
>     R-help@... <mailto:R-help@...> mailing list
>     https://stat.ethz.ch/mailman/listinfo/r-help
>     PLEASE do read the posting guide
>     http://www.R-project.org/posting-guide.html
>     <http://www.r-project.org/posting-guide.html>
>     and provide commented, minimal, self-contained, reproducible code.
>
>

______________________________________________
R-help@... 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.