[R] convert factor data to numeric

[Rolf Turner]

On 14/01/2010, at 6:00 AM, Nathalie Yauschew-Raguenes wrote:

> Hello,
>
> I find a way to convert data in factor type to numeric :
> data_numeric <- as.numeric(as.character(data_factor)).
> It's treaky but works.

Possibly even more ``treaky'' but more efficient is:

	data_numeric <- as.numeric(levels(data_factor)[data_factor])

as has been pointed out quite a few times on this list.

	cheers,

		Rolf Turner

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