Thanks for all these replies, all work perfectly. Sun --- Petr Pikal <[EMAIL PROTECTED]>写道:
> 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�杩袼�-新歌热歌高速下 > > [[alternative HTML version deleted]] > > > > > > Petr Pikal > [EMAIL PROTECTED] > > ___________________________________________________________ 抢注雅虎免费邮箱-3.5G容量，20M附件！
______________________________________________ [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.
