[R] function runif in for loop

[Duncan Murdoch]

On 10/08/2011 7:28 AM, Johannes Radinger wrote:
> Hello,
>
> I'd like to perform a regression using MCMCregress (MCMCpack).
> One variable therefore should be a function rather than a variable:
>
> I want to use X as an input and X should be defined as a random number between to values. Therefore I want to use the function runif like:
> X<-(1, Xa, Xb) but it seems that runif doesn't allow to use vectors.
> So I think I've to calculate the new vector X by using a for loop.

runif() does allow vectors.  Assuming Xa and Xb are vectors of length n, 
then

X <- runif(n, Xa, Xb)

will work.  (Xa and Xb don't both have to be vectors; values will be 
recycled as necessary.)

Duncan Murdoch
> I tried "for (i in 1:length(lT)) T<-runif(1,lT,uT)" but that doesn't work.
> What is the correct for-loop function to create this new vector/variable?
>
> Can I use that function then as an input for MCMCregress?
>
> thank you
>
> Johannes
>
> --
>
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