[R] assign to data.frame

[Thomas Lumley]

On Thu, 13 Jun 2002, Michaell Taylor wrote:
> However, there are actually a number of such variables to be created. Sooo, I
> tried:
>
> add.to.d2 <- names(d1)[!is.element(names(d1),names(d2)]
> for (V in add.to.d2)
> 	assign(paste('d2$',V,sep=''),rep(NA,10))
> 	}
> (ditto for the other data.frame)
>
> which gives me a d2$c in the global space, but not in the d2 dataframe. I see
> options for environment specification in assign, but can't seem to manage to
> specify a dataframe as the environ. Also tried: assign(as.name(paste('d2$',V,
> sep='')),rep(NA,10))  -- which wouldn't seem needed, and indeed, not.
>
> gotta be something I am missing and I am sure it is in the help files
> somewhere, but .... any hints?

You can't do this with assign(), which doesn't dispatch assignment
methods. In this case you can just
   d2[[V]]<-rep(NA,10)

	-thomas

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