Re: [R] changing memory limits to speed up lsoda

From: <>
Date: Thu 27 Oct 2005 - 01:03:24 EST

I don't understand why you think memory is the problem, here. I'd try writing my model in C or Fortran (there is an example in the odesolve package). That speeds things up a lot, and is what I do with slow systems.
R. Woodrow Setzer, Jr.
National Center for Computational Toxicology US Environmental Protection Agency
Mail Drop B205-01/US EPA/RTP, NC 27711
Ph: (919) 541-0128 Fax: (919) 541-1194

             "Martin Henry H.                                           
             <HStevens@muohio                                        To 
             .edu>                    Woodrow Setzer/RTP/USEPA/US@EPA   
             10/26/2005 10:45                                           
             AM                                                 Subject 
                                      changing memory limits to speed   
                                      up lsoda                          

Hi Woody,
I sent this to r-help as well. Thanks in advance for any input.

I am running R 2.2.0 on Mac OS 10.4.2, dual G5 processors with 8 Gig RAM.
I am running a simulation with lsoda that requires ~378 s to complete one set of time intervals. I need to optimize the parameters, and so need to considerably speed up the simulation. I have tried to figure out how to change the appropriate memory allocation and have search R help and Introductory information and the archives, but connot figure out how to allocate more to the right place.
I would greatly appreciate any pointers or tips or leads.

Thank you,
Hank Stevens

Dr. Martin Henry H. Stevens, Assistant Professor 338 Pearson Hall
Botany Department
Miami University
Oxford, OH 45056

Office: (513) 529-4206
Lab: (513) 529-4262
FAX: (513) 529-4243

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