[Maxima] extracting common terms

[Barton Willis]

Maybe you need to append two additional arguments to facsum; try

  facsum(diff(exp,e),diff(v(t,e),e), diff(u(t,e),e), diff(S(t,e),e));


Barton

-----maxima-bounces at math.utexas.edu wrote: -----


>I am trying to solve a system of functional equations using
>perturbation methods.  I have equations the left side of which look
>like, for example,
>
>exp:delta*S(t,e)+M*beta*S(t,e)*v(t,e)^alpha*u(t,e)^(1-alpha)+M*(1-beta)*S
>(t,e)*v(t,e)^alpha*v(t,e)^-alpha;
>
>I would like to bring diff(exp,e) to the form
>
>diff(v(t,e),e)*A + diff(u(t,e),e)*B + diff(S(t,e),e)*C
>
>and get a list [A,B,C].  I tried reading the archives, and found
>facsum, but
>
>facsum(diff(exp,e),diff(v(t,e),e));
>
>does not quite do what I want: fractions remain in the whole thing (I
>want something "flat"), and I don't know how to extract the
>expressions that correspond to A,B,C above.