[datatable-help] Is this supposed to happen?

sean.creighton at citi.com sean.creighton at citi.com
Wed May 23 13:58:14 CEST 2012


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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