[R] remove last row of a data frame

[e-letter]

On 12/12/2012, Daniel Nordlund <djnordlund at frontier.com> wrote:
>> -----Original Message-----
>> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
>> On Behalf Of e-letter
>> Sent: Tuesday, December 11, 2012 11:45 PM
>> To: r-help at r-project.org
>> Subject: [R] remove last row of a data frame
>>
>> Readers,
>>
>> For a data set 'a':
>>
>> 1
>> 2
>> 3
>> 4
>>
>> Please what is the syntax to remove the last row and create a new object
>> 'b':
>>
>> 1
>> 2
>> 3
>>
>> Thanks.
>>
>
> If by data set a you mean a data frame called a, then something like this
> should work:
>
> b <- a[-nrow(a),]
>
> If you haven't already read the manual, "An Introduction to R", that ships
> with every copy of R, then now is the time.
>

Thanks, couldn't find quickly the relevant section in the html
document, but within R, the command 'nrow' is relevant.