just list the variables for which you want to solve -- in this case, leave
off the "x" and you will get
```
>>> soln
[{w: 0.5 - 0.5*x, y: 0.5 - 0.5*x, z: 1.00000000000000}]
```
see also https://github.com/sympy/sympy/issues/2720
/c
On Friday, April 9, 2021 at 1:32:51 PM UTC-5 brandon...@gmail.com wrote:
> Given the snippet below:
>
> from sympy import symbols, solve
> w, x, y, z = symbols("w x y z")
> equations = [
> w + x + y - 1,
> z - 1,
> w/(w+y) - 0.5,
> w/(w+y) + y/(w+y) - 1
> ]
> soln = solve(equations, (w, x, y, z), dict=True)[0] # accept first
> solution
> print(soln)
>
> the soln is:
>
> {
> w: y,
> x: 1.0 - 2.0*y,
> z: 1.000
> }
>
> Is there a way I can use solve or some other function in SymPy to
> change/influence the set of independent variables? In this case, I would
> like to prefer x to be independent (used in the expressions of the soln
> values) instead of y.
>
> This is a simplified of my actual code. In practice, I don't know which
> symbols will can be independent before I call solve, but trivial for me to
> order the symbols in order of my preference for them to be independent, if
> possible.
>
> Cheers,
> Brandon Bocklund
>
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