Re: [R] Delete Block of Rows

From: milton ruser <milton.ruser_at_gmail.com>
Date: Mon, 16 Jun 2008 11:53:47 -0300

Hi there,

The subset function is available on your Base R. So you need not to load any package.
May be it is not working because I suppose that your "rownames" is a sequential one (1...4000). Case it is not true, the command will not work.

Anyway, I think that those line that are working find is simple than you use %in%... etc.

Good luck,

miltinho
Brazil

On 6/16/08, nmarti <nate318i_at_yahoo.com> wrote:
>
>
> Thanks for all the replies.
> My data frame is actually 4000 rows and 10 columns.
>
> This line,
> df <- subset( df, !( rownames(df) %in% 1:25 ) ) Did not work for me. Is
> there a certain library I need to load for this to work (I'm assuming there
> isn't)? I didn't get an error message, warning, or anything; it just
> didn't
> work.
>
> These two lines did work,
> df = df[ -c(1:25), ] Or,
> df = df[ 26:200, ] I'm not sure why they didn't work the first time I
> tried them.
>
> Once again, thanks for the help!
>
>
>
> milton ruser wrote:
> >
> > Hi there,
> >
> > I donīt know if you are trying to solve the delete job or to test how
> > functions work.
> >
> > If you really want to delete lines from a data.frame, try something like
> > this.
> >
> >
> > rowcount<-1:100
> > x<-runif(100)
> > y<-runif(100)
> >
> > df<-data.frame(cbind(rowcount,x,y))
> >
> > df.subset<-subset(df, !(rownames(df) %in% 1:25))
> >
> > # ! (a condition) is the negation of the condition
> >
> > # so the output will be those lines that are not on interval 1:25
> >
> >
> >
> > By the way, it is not a good idea to use "data" as a input argument on
> > a function because "data" is a pre-defined function.
> > Kind regards,
> >
> > miltinho
> >
> >
> >
> > On 6/15/08, nmarti <nate318i_at_yahoo.com> wrote:
> >>
> >>
> >> I am trying to delete a section of rows from a data frame (based on no
> >> condition). Lets say my data frame has 200 rows and I want to delete
> >> rows
> >> 1
> >> through 25. How would I do this?
> >>
> >> I know x[ -1, ] deletes the first row (or any desired row). I tried
> >> using
> >> different variations of this, like x[ -c(1:25), ] but that didn't work.
> >> I
> >> also tried writting a few functions, for example:
> >>
> >> deleteRows <- function( data, s, e, ) {
> >> for( i in s:e )
> >> data[ -i, ]
> >> }
> >> deleteRows( ds, 1, 25 )
> >>
> >> But that didn't work either, it only deleted row 25 (i'm new to writing
> >> functions).
> >> Any thoughts on how to solve my problem would be appreciated.
> >> --
> >> View this message in context:
> >> http://www.nabble.com/Delete-Block-of-Rows-tp17849775p17849775.html
> >> Sent from the R help mailing list archive at Nabble.com.
> >>
> >> ______________________________________________
> >> R-help_at_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.
> >>
> >
> > [[alternative HTML version deleted]]
> >
> >
> > ______________________________________________
> > R-help_at_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.
> >
> >
>
> --
> View this message in context:
> http://www.nabble.com/Delete-Block-of-Rows-tp17849775p17865279.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
> R-help_at_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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