[R] deleting certain observations in a data frame

[Peter Alspach]

Karen

For indices, use the minus sign: yourData[-indicesToBeDeleted,]

For rownames, negate %in%:
yourData[!rownames(yourData)%in%namesToBeDeleted,] 

HTH

Peter Alspach

> -----Original Message-----
> From: r-help-bounces at r-project.org 
> [mailto:r-help-bounces at r-project.org] On Behalf Of Chang Liu
> Sent: Friday, 15 February 2008 9:50 a.m.
> To: r-help at r-project.org
> Subject: [R] deleting certain observations in a data frame
> 
> 
> Hi, I'm wondering what the fastest way is to delete certain 
> data points (observations) in a data frame. 
> I have a vector of the indices/row.names I would like to 
> delete. I have tried replacing list by list, but it always 
> complains about different lengths, "replacing list of length 
> a with length b" and so on.
>  
> Another way to think of it is that it's a generazation of 
> na.rm I guess.
>  
> Thanks,
> Karen
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