This appears to have been introduced in 0.7.3. I reverted to 0.7.2 and get
the expected results.
On Wednesday, September 11, 2013 3:27:22 PM UTC-7, G B wrote:
>
> I'm not sure what's causing this, but solve seems to want to call small
> constants zero:
>
> In [1]: from sympy import *
> In [2]: E,m,c=symbols('E,m,c')
> In [3]: Energy=Eq(E,m*c**2)
>
> In [4]: solve(Energy,E)
> Out[4]: [c**2*m]
>
> In [5]: E2=Energy.subs(c,3e8)
> In [6]: solve(E2,E)
> Out[6]: [9.0e+16*m]
>
> In [7]: e2=Energy.subs(c,3e-8)
> In [8]: solve(e2,E)
> Out[8]: [0.0]
>
> I'm not sure why that happens with very small coefficients. It doesn't
> happen with less small ones:
>
> In [9]: e3=Energy.subs(c,0.5)
> In [10]: solve(e3,E)
> Out[10]: [0.25*m]
>
>
>
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