On 10/08/2011 9:40 AM, Johannes Radinger wrote:
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.
Such things do exist in R, but they aren't easy to set up. Why not just
make X be a function explicitly? That is,
X <- function() runif(length(lT), lT, uT)
Then use X() to call the function where you were previously using X.
Duncan Murdoch
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<jvad...@usgs.gov>
> An: "Johannes Radinger"<jradin...@gmx.at>
> CC: r-help@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"<jradin...@gmx.at>
> To:
> r-help@r-project.org
> Date:
> 08/10/2011 07:23 AM
> Subject:
> [R] function runif in for loop
> Sent by:
> r-help-boun...@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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> PLEASE do read the posting guide
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>
>
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______________________________________________
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
