Re: [R] Return the indices of rows of a data frame

[Bert Gunter]

There are many good R tutorials on the web. Some recommendations can
be found here:

https://www.rstudio.com/online-learning/#R

Please spend some time learning fundamental R constructs and
functionality before posting what appear to be very basic questions
here.

Cheers,
Bert


Bert Gunter

"The trouble with having an open mind is that people keep coming along
and sticking things into it."
-- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )


On Mon, Sep 19, 2016 at 8:37 PM, John  wrote:
> Hi,
>
>I have the following dataframe:
>
>> temp<-data.frame(a=c(1,1,2), b=2:4, c=1:3)
>> row.names(temp)<-c("D", "E", "F")
>> temp
>   a b c
> D 1 2 1
> E 1 3 2
> F 2 4 3
>
>I would like R to tell me which rows has value "a" equal to 1. The
> answer is the first row and the second row, or row D and row E. Which
> function should i use? function subset? function which?
>
>Thanks!
>
> [[alternative HTML version deleted]]
>
> __
> R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
> 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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Re: [R] Return the indices of rows of a data frame

[Robert Baer]

On 9/19/2016 10:37 PM, John wrote:

Hi,

I have the following dataframe:


temp<-data.frame(a=c(1,1,2), b=2:4, c=1:3)
row.names(temp)<-c("D", "E", "F")
temp

   a b c
D 1 2 1
E 1 3 2
F 2 4 3

I would like R to tell me which rows has value "a" equal to 1. The
answer is the first row and the second row, or row D and row E. Which
function should i use? function subset? function which?


row.names(temp[temp$a==1,])

--


--
Robert W. Baer, Ph.D.
Professor of Physiology
Kirksville College of Osteopathic Medicine
A T Still University of Health Sciences
800 W. Jefferson St
Kirksville, MO 63501
660-626-2321 Department
660-626-2965 FAX

__
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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.

Re: [R] Return the indices of rows of a data frame

[Jeff Newmiller]

What do you think?
This is covered in the Introduction to R document that comes with R.
-- 
Sent from my phone. Please excuse my brevity.

On September 19, 2016 8:37:30 PM PDT, John  wrote:
>Hi,
>
>   I have the following dataframe:
>
>> temp<-data.frame(a=c(1,1,2), b=2:4, c=1:3)
>> row.names(temp)<-c("D", "E", "F")
>> temp
>  a b c
>D 1 2 1
>E 1 3 2
>F 2 4 3
>
>   I would like R to tell me which rows has value "a" equal to 1. The
>answer is the first row and the second row, or row D and row E. Which
>function should i use? function subset? function which?
>
>   Thanks!
>
>   [[alternative HTML version deleted]]
>
>__
>R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
>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.

__
R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
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.

[R] Return the indices of rows of a data frame

[John]

Hi,

   I have the following dataframe:

> temp<-data.frame(a=c(1,1,2), b=2:4, c=1:3)
> row.names(temp)<-c("D", "E", "F")
> temp
  a b c
D 1 2 1
E 1 3 2
F 2 4 3

   I would like R to tell me which rows has value "a" equal to 1. The
answer is the first row and the second row, or row D and row E. Which
function should i use? function subset? function which?

   Thanks!

[[alternative HTML version deleted]]

__
R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
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.