[R] ifelse question

[Peter Dalgaard]

jropers at freesurf.fr wrote:
> What is puzzling me is that rnorm(1) is only evaluated *twice*, one time 
> for each branch, with only 2 different random deviates, instead of 
> giving ten different random deviates. y1 has indeed 10 values but with 
> only 2 different ones.
>   
I find it more puzzling why you expect that ifelse,  a function of three 
vector arguments, would cause its input arguments to be reevaluated for  
every element of the result.
 
> I would like to have rnorm be evaluated for each row and collect ten 
> *different* random deviates.
>
> y1
>  [1] 0.4087172 0.7707796 0.4087172 0.4087172 0.7707796 0.4087172 0.4087172
>  [8] 0.7707796 0.7707796 0.4087172
>
>
> Thanks.
>
> Jacques.
>
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