Are the pairs (x,y) belong to some lattice or can change continuously? Does f assume some discrete values (or is constant on sets of positive measure)? If not then it will be hard to randomly select x and y which satisfy the exact equality (this still can happen since there are finitely many computer numbers, but their number is quite large!). So if f change continuously you may need the condition |f(x,y) - c| < epsilon for some epsilon > 0.
Regards, Moshe. --- Arun Kumar Saha <[EMAIL PROTECTED]> wrote: > Here I am in a simulation study where I want to find > different values > of x and y such that f(x,y)=c (some known constant) > w.r.t. x, y >0, > y<=x and x<=c1 (another known constant). Can anyone > please tell me how > to do it efficiently in R. One way I thought that I > will draw > different random numbers from uniform dist according > to that > constraints and pick those which satisfy f(x,y)=c. > However it is not I > think computationally efficient. Can anyone here > suggest me any other > efficient approach? > > Regards, > > ______________________________________________ > 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.
