Re: [R] 0* log(0) should be zero but NaN [Broadcast]

From: Liaw, Andy <andy_liaw_at_merck.com>
Date: Wed 12 Jul 2006 - 10:08:55 EST


Try:

R> (cal <- prob * log(ifelse(prob == 0, 1, prob), base=2)) [1] -0.5000000 -0.5287712 -0.5210897 -0.3321928 0.0000000

Andy

From: Taka Matzmoto
>
> Dear R-users
>
> >prob <- c(0.5,0.4,0.3,0.1,0.0)
> >cal <- prob * log(prob,base=2)
> >cal
> [1] -0.5000000 -0.5287712 -0.5210897 -0.3321928 NaN
>
> Is there any way to change NaN to zero ?
>
> I did come up with this by applying Ripley's relpy to my
> previous question
>
> cal <-prob*log(pmax(prob,0.00000001),base=2)
>
> Any suggestion ?
>
> Thank you
>
> Taka
>
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https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Wed Jul 12 10:16:42 2006

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