Hi, You need to be a lot more specific about what you want. Are you trying to solve a partial differential equation (PDE) in time and space, in spherical coordinates? Do you have a closed form solution that provides the values of the dependent variable (e.g. concentration or temperature) as a function of time and location? If so, it is a simple matter of writing an R function to compute that and plot the results or do whatever you want to do with the result. If there is no closed form solution to the PDE, then you have to solve it numerically using finite-differencing coupled with a time-marching scheme such as Euler's or Runge-Kutta schemes.
Hope this helps, 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 ----- Original Message ----- From: carfer...@alum.us.es Date: Thursday, October 22, 2009 9:45 am Subject: [R] Diffusion of particles inside a sphere To: r-help@r-project.org > Hello veryone, > > I am interested in the diffusion of particles inside a sphere, and its > release through a small pore on the sphere surface. Unfortunately, I > have not found the way to do this in R. Could you help me? > > Thank very much in advance for your help > > ______________________________________________ > R-help@r-project.org mailing list > > PLEASE do read the posting guide > 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.
