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

[Stephan Kolassa]

Hi,

fish.new <- fish[fish$GeoArea==1 & fish$Month==10,]

HTH,
Stephan


pfc_ivan schrieb:
> 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.
> 
>