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 <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 > > -- > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > > -- ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
