[datatable-help] Is this supposed to happen?

[Matthew Dowle]

Hi,
Interesting. Please file a bug.report(package="data.table").
As you say internally it looks like it's converting the position to a name
and then matching again, which isn't right.
In the meantime in v1.8.0 :
set(X,i=NULL,j=2L,value=200L)
In 1.8.1 the i is by default NULL so it's just :
set(X,j=2L,value=200L)
or just
set(X,,2L,200L)
Matthew

> Hi
> 	        X 	<-	data.table(a=rep(1:3,1:3),b=31:36,c=7:12)
> 		X
> 		setnames(X,	2,	"a" )  ## two column named "a" now
> 		X
> 		X[,2:=200L, with=FALSE  ]	# Change the entries of column 2
> 		X[,2, with=FALSE  ]		        # Instead of changing column 2, the code
> appears to have done a look up on the column names and picked the first
> match
> 		X
>
> Can anybody tell me how to change column 2 in this example when I have
> duplicate column names?
>
> Thanks
> Sean
>
>
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