Thanks very much for your rapid help Arun.

Vince


On Apr 12, 2013, at 4:10 PM, arun kirshna [via R] wrote:

Hi,
>From your example data,

dat1<- read.table(text="
id1   id2   value
a      b       10
c      d        11
b     a         10
c      e         12
",sep="",header=TRUE,stringsAsFactors=FALSE)
#it is easier to get the output you wanted
dat1[!duplicated(dat1$value),]
#  id1 id2 value
#1   a   b    10
#2   c   d    11
#4   c   e    12

But, if you have cases like the one below (assuming that all those instances were there is reversed order have the same value)
dat2<- read.table(text="
id1   id2   value
a      b       10
c      d        11
b     a         10
e      c         12
c      e         12
",sep="",header=TRUE,stringsAsFactors=FALSE)
 dat2[apply(dat2[,-3],1,function(x) {x1<- order(x); x1[1]<x1[2]}),]
 # id1 id2 value
#1   a   b    10
#2   c   d    11
#5   c   e    12


#or you have cases like these:

dat3<- read.table(text="
id1   id2   value
a      b       10
c      d        11
b     a         10
a      b        10
e      c         12
c      e         12
c      d         11
",sep="",header=TRUE,stringsAsFactors=FALSE)

 dat3New<-dat3[apply(dat3[,-3],1,function(x) {x1<- order(x); x1[1]<x1[2]}),]
dat3New[!duplicated(dat3New$value),]
#  id1 id2 value
#1   a   b    10
#2   c   d    11
#6   c   e    12
A.K.




>Hi everybody,
>
>I was hoping that someone could help me with this problem. I
have a table with 3 columns. Some rows contain duplicates where the
identifiers in >columns 1 and 2 are in reverse order, but the value
associated with the row is the same.

>
>For example:
>
>id1   id2   value
>a      b       10
>c      d        11
>b     a         10
>c      e         12
>
>Rows 1 and 3 are duplicates (have the same value). I would like
to retain only row 1 and delete row 3. Final table should look like
this:
>
>id1   id2   value
>a      b       10
>c      d        11
>c      e         12
>
>Thanks in advance for any help provided.
>
>Vince

______________________________________________
[hidden email]<x-msg://23/user/SendEmail.jtp?type=node&node=4664105&i=0> 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.


________________________________
If you reply to this email, your message will be added to the discussion below:
http://r.789695.n4.nabble.com/Removing-rows-that-are-duplicates-but-column-values-are-in-reversed-order-tp4664069p4664105.html
To unsubscribe from Removing rows that are duplicates but column values are in reversed order, click here<http://r.789695.n4.nabble.com/template/NamlServlet.jtp?macro=unsubscribe_by_code&node=4664069&code=dnByM0Bjb3JuZWxsLmVkdXw0NjY0MDY5fDEzODMwOTA4MTI=>.
NAML<http://r.789695.n4.nabble.com/template/NamlServlet.jtp?macro=macro_viewer&id=instant_html%21nabble%3Aemail.naml&base=nabble.naml.namespaces.BasicNamespace-nabble.view.web.template.NabbleNamespace-nabble.view.web.template.NodeNamespace&breadcrumbs=notify_subscribers%21nabble%3Aemail.naml-instant_emails%21nabble%3Aemail.naml-send_instant_email%21nabble%3Aemail.naml>





--
View this message in context: http://r.789695.n4.nabble.com/Removing-rows-that-are-duplicates-but-column-values-are-in-reversed-order-tp4664069p4664107.html
Sent from the R help mailing list archive at Nabble.com.
	[[alternative HTML version deleted]]

