[R] newbie question about index

[Joris De Wolf]

what about:
b <- rbind(1*(a==1),1*(a==2),1*(a==3))


z s wrote:
> 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.
> 
>  		
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