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 <[EMAIL PROTECTED]> To: [email protected] 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˙čżńËŃ-иčČȸč¸ßËŮĎ > [[alternative HTML version deleted]] > > Petr Pikal [EMAIL PROTECTED] ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
