Hi Jim, What exactly do you mean by vectorized. I think outer looks like what I was looking for. BUT there was a (weighted) distance matrix calculation that I was trying to vectorize, which wasnt related to this post. Could you proved a bit more details as to what you were referring to, and maybe an example as how to vectorize in R?
Thanks, Sachin On Mon, Nov 28, 2011 at 3:25 PM, jim holtman <jholt...@gmail.com> wrote: > Take a look at 'outer' and vectorized your function. Also look at > 'expand.grid'. > > > On Sunday, November 27, 2011, Sachinthaka Abeywardana < > sachin.abeyward...@gmail.com> wrote: > > Hi All, > > > > I want to do something along the lines of: > > for (i in 1:n){ > > for (j in 1:n){ > > A[i,j]<-myfunc(x[i], x[j]) > > } > > } > > > > The question is what would be the most efficient way of doing this. Would > > using functions such as sapply be more efficient that using a for loop? > > > > Note that n can be a few thousand. Thus atleast a 1000x1000 matrix. > > > > Thanks, > > Sachin > > > > [[alternative HTML version deleted]] > > > > ______________________________________________ > > 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. > > > > -- > Jim Holtman > Data Munger Guru > > What is the problem that you are trying to solve? > Tell me what you want to do, not how you want to do it. > [[alternative HTML version deleted]] ______________________________________________ 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.