MathGroup Archive 1997

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Re: NDSolve

  • To: mathgroup at
  • Subject: [mg8582] Re: [mg8536] NDSolve
  • From: seanross at
  • Date: Sun, 7 Sep 1997 22:13:03 -0400
  • Sender: owner-wri-mathgroup at

N. Kinoshita wrote:
> I wonder why the following did not work.
> NDSolve[{q'[k]==If[k==kss,qprimess,kdotfun/qdotfun],q[kss]=qss},...
>                                    ***************
>                                    The trouble is here.
> kdotfun and qdotfun are both defined previously as functions of [k].
> The error message was like
>   ...does not evaluate at 34.5444 <-this is the value for kss ...
> When I just typed in the same function instead of using 'kdotfun/qdotfun',
> it worked. But I would rather not like to do it because the expression for
> it is sometimes quite complicated.

have you tried including the argument?  ie.  kdotfun[k]/qdotfun[k] ?

If you want to mark a point with a special mark, try using a graphics
primitive like Text, Circle, etc.

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