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

Taka Matzmoto sell_mirage_ne at hotmail.com
Tue Jul 11 22:21:31 CEST 2006

Dear R-users

>prob <- c(0.5,0.4,0.3,0.1,0.0)
>cal <- prob * log(prob,base=2)
[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


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