# Re: [R] integration

Date: Mon, 11 Apr 2011 12:14:20 -0400

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.

Assistant Professor,
Division of Geriatric Medicine and Gerontology School of Medicine Johns Hopkins University

Ph. (410) 502-2619

From: cindy Guo [mailto:cindy.guo3_at_gmail.com] Sent: Saturday, April 09, 2011 5:07 PM
Cc: r-help_at_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 <rvaradhan_at_jhmi.edu<mailto:rvaradhan_at_jhmi.edu>> wrote: ?integrate

From: r-help-bounces_at_r-project.org<mailto:r-help-bounces_at_r-project.org> [r-help-bounces_at_r-project.org<mailto:r-help-bounces_at_r-project.org>] On Behalf Of cindy Guo [cindy.guo3_at_gmail.com<mailto:cindy.guo3_at_gmail.com>] Sent: Friday, April 08, 2011 9:21 PM
To: r-help_at_r-project.org<mailto:r-help_at_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_at_r-project.org<mailto:R-help_at_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_at_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. Received on Mon 11 Apr 2011 - 16:17:19 GMT

Archive maintained by Robert King, hosted by the discipline of statistics at the University of Newcastle, Australia.
Archive generated by hypermail 2.2.0, at Mon 11 Apr 2011 - 17:10:29 GMT.

Mailing list information is available at https://stat.ethz.ch/mailman/listinfo/r-help. Please read the posting guide before posting to the list.