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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