Re: [R] newbie question about index

From: Petr Pikal <petr.pikal_at_precheza.cz>
Date: Fri 01 Sep 2006 - 09:11:15 GMT

Hallo

probably there are other options but

outer(1:3,a, "==")*1

can do what you want.

HTH
Petr

On 31 Aug 2006 at 22:41, z s wrote:

Date sent:      	Thu, 31 Aug 2006 22:41:27 +0800 (CST)
From:           	z s <flyhyena@yahoo.com.cn>
To:             	r-help@stat.math.ethz.ch
Subject:        	[R] newbie question about index

> Hi,
>
> I am trying to convert a variable a = sample(1:3,100,rep = T)
> represents choices into a 3X100 dummy varible b with corresponding
> element set to 1 otherwise 0.
> eg.
>
> a: 1 3 2 1 2 3 1 1....
>
> b: 1 0 0 1 0 0 1 1..
> 0 0 1 0 1 0 0 0...
> 0 1 0 0 0 1 0 0...
>
> Is there something like b[a] =1 existing? I could not figure this out
> myself.
>
>
> ---------------------------------
> Mp3-¸ȸ
> [[alternative HTML version deleted]]
>
>

Petr Pikal
petr.pikal@precheza.cz



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