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Re: NDSolve


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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