Given Eq(L, R) where L and R are the left and right hand sides of the
equation, try: `Eq(*list(reversed((L - R).expand().as_indepedent(foo,
as_Add=True))))` where foo is the variable of interest to get the new
equation.
On Tuesday, April 25, 2017 at 2:35:10 PM UTC-5, Jonathan Essen wrote:
>
> I am attempting to use sympy to generate an implicit scheme for the heat
> equation. With the Crank-Nicolson time discretization I have equation 1
> (attached).
>
> Is there any way to isolate all occurrences of $\rho^{n+1}$ (along with
> its derivatves) to the lefthand side, as in equation 2 (attached).
>
> I would be very interested to know! Apparently it has something to do with
> the collect function.
>
> Best,
> Jonathan
>
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