On Thu, 22 May 2014 09:11:43 PM Ricardo Rocha wrote:
> Hi everybody.
>
> Consider the following exampling code:
>
> x=numeric()
> for(i in 1:10){
> u=runif(1,-1,2)
> x[i]=log(u)
> }
> This code, in each interation, generates a random value in the (-1,2)
> interval and then calculates the log of the value. When the generated
value
> is less than 0 the log produces a NaN, which gives a warning.
>
> What I want is to make it start over when a warning is produced, in
order to
> repeat it until a positive value is generated and therefore the log is
> calculated. Logically, would be like: "if there's a warning here, go back
> at the beginning and start over", without changing the iteration.
>
> Could someone help me with some directions?
>
Hi Ricardo,
Perhaps what you want is something like this:
i<-1
while(I < 11) {
u<-runif(1,-1,2)
if(u >= 0) {
x[i]<-log(u)
i<-i+1
}
}
Jim
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