[BioC] splitting a data frame

[Seth Falcon]

<kfbargad at ehu.es> writes:

> 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?

This is not a BioC specific question and would be better asked on the
R-help list.

Yes, you can do this by creating a vector of row indices.  See
help("sample").  You don't need subset.  Just "[".

v = sample(1:nrow(df))
df[v[1:50], ]
df[v[51:nrow(df)], ]

+ seth

-- 
Seth Falcon | Computational Biology | Fred Hutchinson Cancer Research Center
http://bioconductor.org