[BioC] splitting a data frame

[Jenny Drnevich]

Hi David,

This is a general R question and not a Bioconductor-specific 
question, but... Yes, first create the vector of random numbers using 
sample(). However, you don't need to use subset() to subset your 
dataframe, you can just use brackets [] to subset:

rand.num <- sample(1:200, 150)

sub1.150 <- yourdataframe[rand.num,]
sub2.50 <- yourdataframe[-rand.num,]

Cheers,
Jenny

At 07:14 AM 4/26/2007, kfbargad at ehu.es wrote:

>Dear list,
>
>sorry for this very basic question but I have searched the R manual
>without success. What function do I need to randomly split a
>data.frame into two data.frames (for example a data.frame containing
>200 rows and 5 columns into two of say 150 and 50 rows each)? Should I
>first create a vector of 150 random numbers between 1 and 200 (but
>how?) and then use subset() function?
>
>Thanks in advance for your help
>David
>
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Jenny Drnevich, Ph.D.

Functional Genomics Bioinformatics Specialist
W.M. Keck Center for Comparative and Functional Genomics
Roy J. Carver Biotechnology Center
University of Illinois, Urbana-Champaign

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e-mail: drnevich at uiuc.edu