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Re: Urgent!! Help about NDSolve

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  • Subject: [mg28712] Re: Urgent!! Help about NDSolve
  • From: "Paul Lutus" <nospam at>
  • Date: Thu, 10 May 2001 07:54:56 -0400 (EDT)
  • References: <9dauml$>
  • Sender: owner-wri-mathgroup at

"Diego Martin Martin" <diego at> wrote in message
news:9dauml$e1u at
> Hello,
> I work on semiconductor manufacturing. Now Im trying to simulate the
> behaviour of a p-n juntion (with some particular changes) in a
> with Mathematica 4.0.
> I have a problem when I try to solve the Continuity Equation for
> 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
> integration interval.
> When I try to solve it usind NDSolve, I obtain a numerical solution that
> 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
> 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?

That should be simple. Tell us what the problem is, your solution, and
specify what is meant by "incorrect" -- what source are you relying on for a
correct solution? Without this essential information, we can only say, "Umm,
there must be some sort of problem."

Paul Lutus

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