?model.matrix

On Fri, Jul 27, 2012 at 11:32 AM, xuan zhao <xuan.zhao@sentrana.com> wrote:

> Hi All,
> I want to turn a categorical array (array with factors) into a matrix with
> dummy variables. like array=c(a,a,b,b,b) should be turned into:
> a b
> 1 0
> 1 0
> 0 1
> 0 1
> 0 1
> Do you know any way of doing this?
> Thanks
>
>
>
> --
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>
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