p1982[sample(nrow(p1982),200000),]



On 12/8/06, Aimin Yan <aiminy@iastate.edu> wrote:
>
> I have a data set like this:
> if I want to less than 200000 obs from this data set.
> How can I do these?
>
> > str(p1982)
> 'data.frame':   465979 obs. of  6 variables:
> $ p  : Factor w/ 1982 levels "154l_aa","1A0P_aa",..: 1 1 1 1 1 1 1 1 1 1
> ...
> $ aa : Factor w/ 19 levels "ALA","ARG","ASN",..: 2 16 4 5 18 3 19 3 2 9
> ...
> $ as : num  152.0  15.9  65.1  57.2  28.9 ...
> $ ms : num  108.8  28.3  59.2  49.9  31.8 ...
> $ cur: num  -0.1020  0.2564  0.0312 -0.0550  0.0526 ...
> $ sc : num   92.10 103.67   7.27  72.98  96.12 ...
>
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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.
>



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

What is the problem you are trying to solve?

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