On Fri, Jan 6, 2012 at 4:52 PM, Bjorn <[email protected]> wrote:
> Hi, I am new to sympy and I have a basic question.
> I would like to use sympy to sovle simple sets of equations in a text
> editor.
>
> like given the following as plain text:
> a = 10
> b = 20
> a * 12 + 50*c == 456 + b
>
> and an instruction to solve for c, then ptorduce:
>
> c = 7.12
>
> I know sympy comes with a solver that can solve systems of f(x)=0,
> but in the problem above the third equation needs to be rewritten for
> this to work.
> To me, this seems as something that might have been done before?
> Id be grateful for directing me to a resource or telling me how or why
> this is harder than it seems.
>
>
Given a string with all three equations, it's not too hard to parse it up
and prepare it for the solver with something like this:
```python
>>> eqs='''
... a=10
... b=20
... a*12+50*c==456+b'''
>>> new_eqs = [Eq(*[S(ei) for ei in e.replace('==','=').split('=')]) for
e in eqs.strip().splitlines()]
>>> solve(new_eqs)
{a: 10, b: 20, c: 178/25}
```
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