I would have used the search strategy "stochastic". Despite the risk that such a strategy could bring up anything to do with statistics, it in fact brings me to Stefano Iacus' package sde (and refers to the accompanying book, "Simulation and Inference for Stochastic Differential Equations With R Examples"). Further links on that page were to:
http://bm2.genes.nig.ac.jp/RGM2/pkg.php?p=sde

.. which gives a better picture of the capabilities of that package.

Also a possible package of possible interest to this rather vague questioner might be:

http://crantastic.org/packages/PSM

And even though it is pitched to population biologists, I thought that a package that included a "decaying-dimerization reaction set, [and] linear chain system":

http://crantastic.org/packages/GillespieSSA

... might have examples of interest to biological chemists.

--
David.


On Oct 31, 2009, at 7:05 AM, Carlos Ortega wrote:

Hello,

Please look here:
http://crantastic.org/search?q=biology

<http://crantastic.org/search?q=biology>Regards,
Carlos.

On Fri, Oct 30, 2009 at 6:12 PM, <mau...@alice.it> wrote:

Is there any R package that implements the same capability of MatLab
toolbox called SimBiology ?
We are expecially interested in protein-protein interactions and network
analysis.
As far as I know SimBiology implements a system of ODEs reflecting the
kinetic chemical reactions.
We would be more interested in stochastic simulations.
Thank you in advance.

Maura


tutti i telefonini TIM!


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David Winsemius, MD
Heritage Laboratories
West Hartford, CT

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