Change 1 to some other number to get more points from runif() More generally, take a look at "An Introduction to R" and read most everything you can find on the topic of vectorization. If you don't know how to get "An Introduction to R", try typing help.start() at your prompt and it should happen automatically.
Cheers, Michael On Wed, Oct 10, 2012 at 3:15 PM, Poizot Emmanuel <emmanuel.poi...@cnam.fr> wrote: > Dear all, > > I have two coordinates vectors, say X and Y of length n. > I want to generate for each couple of coordinates X1,Y1 X2,Y2 X3,Y3....Xn,Yn > a random coordinate which is located in a square define as X +/- dx and Y > +/- dy. > I saw the runif function which can generate for just one value at a time > what I want : runif(1, X - dx, X + dx) for X and runif(1, Y - dy, Y + dy) > for Y. > I would like to know if there is not a more powerfull way in R to generate > directly the set of random coordinates. > Regards > > -- > Emmanuel Poizot > > > ______________________________________________ > 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.
