> ct.df[ct.df$conc < 25,"time"]
[1] 10 11 12 13 14 15
> ct.df[ct.df$conc < 25,"time"][1]
> df[df$conc < 25,"time"][1]
[1] 10
See also help("order") if conc is not ordered.
On 02/07/10 22:50, oscar linares wrote:
time conc
1 0 164.495456
2 1 133.671185
3 2 108.622975
4 3 88.268468
5 4 71.728126
6 5 58.287225
7 6 47.364971
8 7 38.489403
9 8 31.276998
10 9 25.416103
11 10 20.653462
12 11 16.783276
13 12 13.638313
14 13 11.082674
15 14 9.005927
16 15 7.318336
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