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List:       r-help
Subject:    [R] newbie question about index
From:       z s <flyhyena () yahoo ! com ! cn>
Date:       2006-08-31 14:41:27
Message-ID: 20060831144127.10844.qmail () web15610 ! mail ! cnb ! yahoo ! com
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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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