[R] newbie question about index

From: z s <flyhyena_at_yahoo.com.cn>
Date: Thu 31 Aug 2006 - 14:41:27 GMT


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.

  1. 1 3 2 1 2 3 1 1....
  2. 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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