On 11-07-2013, at 09:13, Raphaëlle Carraud <raphaelle.carr...@oc-metalchem.com> wrote:
> Hello, > > I have the following differential equation system to solve, the variables I > wish to obtain being A, B, C, D, E, I, G and H. > > 0 = -dA + dB + 2*dC - 2*r1 - 2*r5 > 0 = dA + dD + r1 + r4 > 0 = K2 - C/B^2 > 0 = K3 - D/(A*B) > > 0 = r5 + 2*r4 - dE > 0 = r5 -dI > 0 = -r5 - r4 - dG > 0 = -r1/2 - dH > > r1, r4 and r5 are variables expressed as functions of A, B, C, D, I, G and H, > calculated previously in the integrated function. K2 and K3 are parameters. > > As I have two algebraic equations, I think this system is a DAE (Algebraic > differential equation). I found in the package deSolve two functions that > resolve DAE but I didn't manage to obtain a solution; it says that the > variable dA cannot be found. > Show us your script where you define the function and run the DAE solver. Without that nobody can provide an answer. Berend. > Does anyone know how to solve this problem? > > Thank you > > Raphaëlle Carraud > > > Raphaëlle Carraud > > [[alternative HTML version deleted]] > > ______________________________________________ > 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. ______________________________________________ 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.
