[R] A programming question - is what I want to do possible in R?

[jim holtman]

Add a dummy argument to the function:

>> randomSamples<-lapply(1:2000,function(dummy){
> + meta_comp[sample(nrow(meta_comp),nTimes),]})

On Mon, Sep 28, 2009 at 9:39 PM, ewaters <ewaters at nchecr.unsw.edu.au> wrote:
>
> Thanks for your help.
>
> Unfortunately when I try it this generates an error as follows:
>
>> randomSamples<-lapply(1:2000,function(){
> + meta_comp[sample(nrow(meta_comp),nTimes),]})
> Error in FUN(1:2000[[1L]], ...) : unused argument(s) (1:2000[[1]])
>
>
>
>
> jholtman wrote:
>>
>> nTime <- 15  # how many samples to take
>> randomSamples <- lapply(1:2000, function(){
>>     largeDF[sample(nrow(largeDF), nTimes),]
>> })
>>
>> This will create a list of 2000 dataframes with the samples
>>
>> On Sun, Sep 27, 2009 at 10:45 PM, ewaters <ewaters at nchecr.unsw.edu.au>
>> wrote:
>>>
>>> I have a large data frame, 77 rows, with 10 columns. Each row represents
>>> a
>>> unique individual with 10 characteristics, some of which are categorical
>>> factors and some continuous numeric variables. Each of the ten variables
>>> is
>>> important (the 10 columns obviously correspond to the individuals of
>>> interest). Importantly, this data set represents a population (not
>>> sample)
>>> of people with a certain medical condition.
>>>
>>> What I want to do is to select 2000 random samples of between 2 and 24
>>> individuals, preserving all the information.
>>>
>>> I can easily write loops that will sample from 1:77 2 - 24 times, what I
>>> really want to know is there any way to easily link the output of loops
>>> like
>>> that to the data set so I don't have to trawl through and do it manually
>>> 2000 times?
>>>
>>> Any advice on whether I should even attempt that in R, or try some sort
>>> of
>>> hash table in C or somewhere, would be appreciated.
>>> --
>>> View this message in context:
>>> http://www.nabble.com/A-programming-question---is-what-I-want-to-do-possible-in-R--tp25639955p25639955.html
>>> Sent from the R help mailing list archive at Nabble.com.
>>>
>>> ______________________________________________
>>> R-help at 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.
>>>
>>
>>
>>
>> --
>> Jim Holtman
>> Cincinnati, OH
>> +1 513 646 9390
>>
>> What is the problem that you are trying to solve?
>>
>> ______________________________________________
>> R-help at 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.
>>
>>
>
> --
> View this message in context: http://www.nabble.com/A-programming-question---is-what-I-want-to-do-possible-in-R--tp25639955p25655666.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
> R-help at 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.
>



-- 
Jim Holtman
Cincinnati, OH
+1 513 646 9390

What is the problem that you are trying to solve?