[R] a quick question about "rbinom"

[David Winsemius]

On Jan 4, 2012, at 7:43 PM, Robert Baer wrote:

> -----Original Message----- From: lynn.tsai
> Sent: Wednesday, January 04, 2012 3:38 PM
> To: r-help at r-project.org
> Subject: [R] a quick question about "rbinom"
>
> Hello, I have the following code using rbinom, but I don't  
> understand what
> *"+1"* means in the code. Could someone help? Thanks so much,
>
>> X1<-c("A","B")[rbinom(n,1,0.6)+1]
>> X2<-c("C","D")[rbinom(n,1,0.1)+1]
>
> It mean index the vector as 1's and 2's  (1st and 2nd item in list)  
> rather than 0's and 1's because R indices start at 1, not 0.
>
> ------------------------------------------
> Robert W. Baer, Ph.D.
> Professor of Physiology
> Kirksville College of Osteopathic Medicine
> A. T. Still University of Health Sciences
> 800 W. Jefferson St.
> Kirksville, MO 63501
> 660-626-2322
> FAX 660-626-2965
>
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David Winsemius, MD
West Hartford, CT