
sample(data, 3, replace=FALSE)[,-1:2]
or
sample(data, 3, replace=FALSE)[,-c("id","pID50")]

Tyler

On Wed, Jul 14, 2010 at 1:17 PM, Addi Wei [via R] <
ml-node+2289092-1912443153-77052@n4.nabble.com<ml-node%2B2289092-1912443153-77052@n4.nabble.com>
> wrote:

>       id pID50      apol     a_acc    a_acid     a_aro a_base   a_count
> 1 mol.11  3.63 -0.882267 -0.527967 -0.298197 -1.032380      0 -1.063410
> 2 mol.14  3.38 -1.007330 -0.527967 -0.298197 -1.032380      0 -1.063410
> 3 mol.19  3.18  1.153560  1.407910 -0.298197  1.254100      0  1.160080
> 4 mol.20  3.14  0.183448 -0.527967 -0.298197  0.873019      0  0.290021
> 5 mol.29  2.77 -0.273901 -0.527967 -0.298197  0.110860      0 -0.193347
> 6 mol.30  2.74 -0.230593 -0.527967 -0.298197  0.110860      0  0.000000
> 7 mol.40  2.16 -1.117550 -0.527967 -0.298197 -1.032380      0 -1.256760
> 8 mol.45  1.90 -0.383560 -0.527967 -0.298197  0.110860      0 -0.290021
> 9 mol.48  1.73 -0.383560 -0.527967 -0.298197  0.110860      0 -0.290021
>
>
> What if I want to exclude 2 columns?
> For example:   sample(data, 3, replace=FALSE)     ##from my sample, i want
> to exclude *both *id and pID50
>
> Thanks much.
>
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