[R] Which variable exist after random

[Achim Zeileis]

On Wed, 1 Jun 2005 17:05:52 +0200 Sofyan Iyan wrote:

> Dear R-helper,
> How could I count only some variable was exist after running sample
> (random) function.

I'm not completely sure what you want, but maybe you want to look at
table() and try print(table(x)) instead of print(x). Those levels with 0
occurences don't occur in the random sample.
Z

> For example,
> 
> > testx <- factor(c("Game","Paper","Internet","Time","Money"))
> >    for(i in 1:2) {
> +        x <- sample(testx,replace=TRUE)
> +        print(x)
> +    }
> [1] Money    Money    Time     Internet Time    
> Levels: Game Internet Money Paper Time
> [1] Time  Money Game  Money Money
> Levels: Game Internet Money Paper Time
> > 
> 
> The result above Game, Internet, Money, and Time only exist and
> "Paper" was missing.
> Best, Sofyan
> 
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