jim holtman wrote:
Add a dummy argument to the function:
randomSamples<-lapply(1:2000,function(dummy){
+ meta_comp[sample(nrow(meta_comp),nTimes),]})
Or
df = data.frame(x=1:10, y=10:1)
replicate(10, df[sample(nrow(df), 5),], simplify=FALSE)
Martin
On Mon, Sep 28, 2009 at 9:39 PM, ewaters <ewat...@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 <ewat...@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.
--
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--
Jim Holtman
Cincinnati, OH
+1 513 646 9390
What is the problem that you are trying to solve?
______________________________________________
R-help@r-project.org mailing list
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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.
--
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@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.
--
Martin Morgan
Computational Biology / Fred Hutchinson Cancer Research Center
1100 Fairview Ave. N.
PO Box 19024 Seattle, WA 98109
Location: Arnold Building M1 B861
Phone: (206) 667-2793
______________________________________________
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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.
