Have you tried impdiff, in the share/contrib directory?
Dan Stanger
egc wrote:
> GIven a polynmial in multiple variables, I'm looking for the Maxima
> equivalent of the Maple function implicitdiff.
>
> Say
>
> f:=lamda^2-lambda*c-a*lambda+a*c-b^2=0
>
> To implicitly differentiate lambda with respect to in Maple, I'd
> simply enter
>
> implicitdiff(f,lambda,c)
>
> yielding
>
> (a-lambda)/(-2lambda+c+a)
>
>
> There is no straight equivalent in Maxima for the implicitdiff command
> in Maple (not that I can find). Did find implicit_derivative, but I
> can't seem to make out exactly what it does (since there are no
> examples I could find that demonstrated it). Google didn't seem to
> help here much either.
>
> So, how does one do simple implicit differentiation in Maxima? Is
> there a simple 'single command' to do the trick, or do I have to break
> up the problem in pieces, somehow?
>
> Pointers to the obvious appreciated.
>
> Thanks very much in advance.
>
>
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