[R] Remove

[Ashta]

Thank you Jeff,

subset( DM, "B" != x ), this works if I know the group only.
But if I don't know that group in this case "B", how do I identify
group(s) that  all elements of x have the same value?

On Wed, Dec 6, 2017 at 5:48 PM, Jeff Newmiller <jdnewmil at dcn.davis.ca.us> wrote:
> subset( DM, "B" != x )
>
> This is covered in the Introduction to R document that comes with R.
> --
> Sent from my phone. Please excuse my brevity.
>
> On December 6, 2017 3:21:12 PM PST, David Winsemius <dwinsemius at comcast.net> wrote:
>>
>>> On Dec 6, 2017, at 3:15 PM, Ashta <sewashm at gmail.com> wrote:
>>>
>>> Hi all,
>>> In a data set I have group(GR) and two variables   x and y. I want to
>>> remove a  group that have  the same record for the x variable in each
>>> row.
>>>
>>> DM <- read.table( text='GR x y
>>> A 25 125
>>> A 23 135
>>> A 14 145
>>> A 12 230
>>> B 25 321
>>> B 25 512
>>> B 25 123
>>> B 25 451
>>> C 11 521
>>> C 14 235
>>> C 15 258
>>> C 10 654',header = TRUE, stringsAsFactors = FALSE)
>>>
>>> In this example the output should contain group A and C  as group B
>>> has   the same record  for the variable x .
>>>
>>> The result will be
>>> A 25 125
>>> A 23 135
>>> A 14 145
>>> A 12 230
>>> C 11 521
>>> C 14 235
>>> C 15 258
>>> C 10 654
>>
>>Try:
>>
>>DM[ !duplicated(DM$x) , ]
>>>
>>> How do I do it R?
>>> Thank you.
>>>
>>> ______________________________________________
>>> R-help at 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.
>>
>>David Winsemius
>>Alameda, CA, USA
>>
>>'Any technology distinguishable from magic is insufficiently advanced.'
>>  -Gehm's Corollary to Clarke's Third Law
>>
>>______________________________________________
>>R-help at 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.