[R] Omitting a desired line from a table [Beginner Question]

[Kingsford Jones]

see

?subset

Or use indexing, which is covered in section 2.7 of an introduction to
R (but note that a data frame has 2 dimensions)

hth,

Kingsford Jones


On Sun, Jan 25, 2009 at 3:06 PM, pfc_ivan <pfc_ivan at hotmail.com> wrote:
>
> I am a beginner using this R software and have a quick question.
>
> I added a file into the R called fish.txt using this line.
>
> fish<-read.table("fish.txt", head=T, fill=T)
>
> The .txt file looks like this. Since it contains like 300000 lines of data I
> will copy/paste first 5 lines.
>
> Year GeoArea  SmpNo   Month
> 1970        1            13                 7
> 1971        1            13                10
> 1972        1            13                 8
> 1973        2            13                10
> 1974        1            13                11
>
> Now what I want to do is to omit all the lines in the file that arent
> happening in GeoArea 1, and that arent happening in Month 10. So basically
> The only lines that I want to keep are the lines that have GeoArea=1 and
> Month=10 at the same time. So if GeoArea=2 and Month=10 I dont need it. So i
> just need the lines that have both of those values correct. How do I delete
> the rest of the lines that I dont need?
>
> Thank you everyone.
>
>
> --
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