Hello,
I don't see the problem.
d <- read.table(text="
ParticipID ERP Electrode
1 s1 0.0370 FP1
2 s2 35.0654 FP2
3 s3 -3.3852 F4
4 s4 2.6119 P3
5 s5 0.1224 P4
6 s6 -5.3153 O1
", header=TRUE)
str(d)
wanted <- c("FP1", "FP2", "F4")
subset(d, Electrode %in% wanted)
#output
# ParticipID ERP Electrode
#1 s1 0.0370 FP1
#2 s2 35.0654 FP2
#3 s3 -3.3852 F4
But if you can't subset because the variable Electrode is a factor, use
as.character(Electrode).
Hope this helps,
Rui Barradas
Em 10-08-2012 10:07, simona mancini escreveu:
> Hi,
>
>
> I need to subset different levels of vector in a dataset to create a new
> dataframe that contains only these. These observations are not numerical, so
> I can't use the subset() function (at least this is the response I get from
> R).
> Suppose the dataframe looks like this:
>
>
>
> ParticipID ERP Electrode
> 1 s1 0.0370 FP1
> 2 s2 35.0654 FP2
> 3 s3 -3.3852 F4
> 4 s4 2.6119 P3
> 5 s5 0.1224 P4
> 6 s6 -5.3153 O1
>
>
> I want to create a subset of the dataframe with only the FP1, FP2, F4 levels
> of Electrode, how do I do?
> (actually the levels I have to filter are much more than these three, but
> this is just to give an example).
>
> I know this is a trivial question, but I am still getting familiar with R...
>
> Thanks a lot,
>
> s.
>
> [[alternative HTML version deleted]]
>
>
>
> ______________________________________________
> R-help@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
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