Urgent!! Help about NDSolve
- To: mathgroup at smc.vnet.net
- Subject: [mg28685] Urgent!! Help about NDSolve
- From: "Diego Martin Martin" <diego at ies-def.upm.es>
- Date: Wed, 9 May 2001 04:20:06 -0400 (EDT)
- Sender: owner-wri-mathgroup at wolfram.com
Hello,
I work on semiconductor manufacturing. Now Im trying to simulate the
behaviour of a p-n juntion (with some particular changes) in a semiconductor
with Mathematica 4.0.
I have a problem when I try to solve the Continuity Equation for minoritary
electrons in the p-type region. This is a Linear with Non-Constant
Coefficients Ordinary Differential Equation with boundary conditions
involving both the function and its derivatives at the start and end of the
integration interval.
When I try to solve it usind NDSolve, I obtain a numerical solution that is
not correct.
Is there some other function or package to solve non-linear differential
equations?
Could I obtain some improvement doing the traslation to a system of diff.
equations?
Sometimes I obtain an error message that sais I must increase the
WorkingPrecision option, because when trying to evaluate some expresion the
limit was reached. I have tryed to change the AccuracyGoal, PrecisionGoal
and WorkingPrecision options, but the numerical solution remain incorrect.
What can I do to solve this problem?
Thank you in advance. Regards,
Diego.