Hi
I what version of SymPy did you try this?
On 4 August 2013 15:33, George Gerber <george.ger...@gmail.com> wrote:
> Good day,
> I am trying to solve three force equilibrium equations. I have simplified
> the code below to only 1 equation to better show the error i get
> (typeerror: unhashable type list). The problem appears to be the use of
> piecewise. Would somebody be so kind as to show how to make piecewise and
> solve play along?
>
> from sympy import symbols,solve,Piecewise
> e,emax,smax=symbols('e emax smax')
> s=Piecewise((0,e<=0),(e/emax*smax,e<emax),(smax,True))
> print solve([sigma-1],[e])
>
>
>
>
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