x, y are cont. variable, and f also have to be cont.. And your second suggestion is correct of course, it actually should be |f(x,y) - c| < epsilon
Thanks On Tue, Apr 29, 2008 at 12:34 PM, Moshe Olshansky <[EMAIL PROTECTED]> wrote: > 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.
