Re: [R] Delete Block of Rows

From: nmarti <nate318i_at_yahoo.com>
Date: Mon, 16 Jun 2008 07:11:03 -0700 (PDT)

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 donĀ“t 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
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>> PLEASE do read the posting guide
>> http://www.R-project.org/posting-guide.html
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>>

>
> [[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.
>
>
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Received on Mon 16 Jun 2008 - 14:29:22 GMT

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