R help - Jun 2010 - Desolve package: How to pass thousand of parameters to C compiled code?

Hi,

I have used DeSolve package for my ODE problem regarding infectious disease
transmission and currently am trying to pass lots (roughly a thousand) of model
parameters to the C compiled model (I have to use C compiled code instead of R
code purely because of the speed).

I can't go define it one by one as it gonna take ages to finish and also
quite difficult to revise. I have read the instructions in "Writing Code in
Compiled Languages", which is very well written, but still have no clue on
how to proceed.

Please can anyone suggest the best way to go about this, and also the places
where I can find examples of DeSolve C compiled code.

Thank you very much in advance.

Nar Pun
CMMU/MUTH

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<cmmu_mile <at> yahoo.com> writes:
> 
> Hi,
> 
> I have used DeSolve package for my ODE problem regarding
> infectious disease transmission and currently am
> trying to pass lots (roughly a thousand) of model parameters 
> to the C compiled model (I have to use C
> compiled code instead of R code purely because of the speed).
> 
> I can't go define it one by one as it gonna take ages to finish 
> and also quite difficult to revise. I have read
> the instructions in "Writing Code in Compiled Languages", which
> is very well written, but still have no
> clue on how to proceed.
> 
> Please can anyone suggest the best way to go about this, and also the
places
where I can find examples of
> DeSolve C compiled code.
> 
  There's another example of compiled code in 
http://www.jstatsoft.org/v33/i09/paper , but it probably
won't say anything the 'Writing Code' guide doesn't already
cover.  I found the guide pretty complete ...

  I would suggest that you pack your parameters into a single
numeric vector (or several, if that makes more sense) and pass
them that way.

  What kind of infectious disease data do you have that will
allow you to fit a model with thousands of parameters ... ??
(Just curious.)