It does. See `lower' and `upper' arguments. Why are y and z not known? Say, you want the marginal of x, i.e. integrate over x. Now, y and z are fixed. You fix them at different values, but they are known.
Ravi. ------------------------------------------------------- Ravi Varadhan, Ph.D. Assistant Professor, Division of Geriatric Medicine and Gerontology School of Medicine Johns Hopkins University Ph. (410) 502-2619 email: rvarad...@jhmi.edu<mailto:rvarad...@jhmi.edu> From: cindy Guo [mailto:cindy.g...@gmail.com] Sent: Saturday, April 09, 2011 5:07 PM To: Ravi Varadhan Cc: r-help@r-project.org Subject: Re: [R] integration 'integrate' does not allow parameter limits. For example, the limits of x is (z/y, Inf) while z and y are unkonwn. On Fri, Apr 8, 2011 at 9:46 PM, Ravi Varadhan <rvarad...@jhmi.edu<mailto:rvarad...@jhmi.edu>> wrote: ?integrate ________________________________________ From: r-help-boun...@r-project.org<mailto:r-help-boun...@r-project.org> [r-help-boun...@r-project.org<mailto:r-help-boun...@r-project.org>] On Behalf Of cindy Guo [cindy.g...@gmail.com<mailto:cindy.g...@gmail.com>] Sent: Friday, April 08, 2011 9:21 PM To: r-help@r-project.org<mailto:r-help@r-project.org> Subject: [R] integration Hi, All, I have a density function with 3 variables which is defined on some irregular domain, and I want to get the marginal distribution of each variable. Is there any function doing this? A simple example is p(x,y,z)=x*y*z*I(xy>z). So each marginal distribution is a function of the other two variables. My density form is very complicated, so I cannot do it by hand. I was just wondering if there is any function in R for this? Thanks, Cindy [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org<mailto: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<http://www.r-project.org/posting-guide.html> and provide commented, minimal, self-contained, reproducible code. [[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.
