[R] function runif in for loop

[Johannes Radinger]

Jean,

thank you for your answer.
especially the line X <- numeric(length(lT)) helped me a lot.

Anyway, in my case I'd like to get a "dynamic" variable or better a
function for X. I mean if i try to call X I'd like that this drawing of random number is performed. In the case now if I call X several times I'll always get the same random numbers.
 
I thought about something like:
X <- for (i in 1:length(lT)) runif(1, lT[i], uT[i])

So that I can use X as a variable for multiple runs and
each run new random values are used.

thank you
Johannes

-------- Original-Nachricht --------
> Datum: Wed, 10 Aug 2011 08:19:07 -0500
> Von: Jean V Adams <jvadams at usgs.gov>
> An: "Johannes Radinger" <JRadinger at gmx.at>
> CC: r-help at r-project.org
> Betreff: Re: [R] function runif in for loop

> Johannes,
> 
> You have the loop set up right, you just need to add indexing to refer to 
> the looping variable, i.
> 
> lT <- sample(1:10)
> uT <- sample(21:30)
> X <- numeric(length(lT))
> 
> for (i in 1:length(lT)) X[i] <- runif(1, lT[i], uT[i])
> 
> X
> 
> Note that I changed the name of the result from T to X, because T has 
> special meaning in R.
> 
> Jean
> 
> `·.,,  ><(((º>   `·.,,  ><(((º>   `·.,,  ><(((º>
> 
> Jean V. Adams
> Statistician
> U.S. Geological Survey
> Great Lakes Science Center
> 223 East Steinfest Road
> Antigo, WI 54409  USA
> 
> 
> 
> From:
> "Johannes Radinger" <JRadinger at gmx.at>
> To:
> r-help at r-project.org
> Date:
> 08/10/2011 07:23 AM
> Subject:
> [R] function runif in for loop
> Sent by:
> r-help-bounces at r-project.org
> 
> 
> 
> 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.
> 
> 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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