[R] differential equations

[Jesus Maria Frias Celayeta]

Hi Heberto!
    I think there is not a solver for differential equations still in R.However
don't give up that easy:

    -you can write your models using your favourite ode solver library (limited
C or Fortran) and then dyn.load() the model, so you can use it inside R. It is
not too difficult, and if you are used to a certain library where you have your
models, is probably the easiest way.

    -there is a preliminar porting to R of the nls2 library, which is a library
that makes nonlinear regression from differential equation models. It is a bit
difficult to install, and is also not easygoing, but the nonlinear regression
works well.  In that library there is a way to actually compile a differential
equation model and integrate it using the  lsode routine from ODEPACK.  So if
you want to see how to plug a ode solver with R in a more general way you can
start having a look at it in

   http://www-bia.inra.fr/J/AB/nls2/welcome.html


cheers,

IOsu



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