Comment #5 on issue 1275 by ondrej.certik: tsolve errors on exponentials
http://code.google.com/p/sympy/issues/detail?id=1275
Thanks, thats another bug, I made it the issue 1276.
The patch now applies. I created a git patch of it, attached. So before the
patch:
In [1]: tsolve(1.0 + 2.0*x + 3.0*sqrt(1-x**2),x)
---------------------------------------------------------------------------
AssertionError Traceback (most recent call last)
/home/ondra/repos/sympy/<ipython console> in <module>()
/home/ondra/repos/sympy/sympy/solvers/solvers.py in tsolve(eq, sym)
758 break
759 else:
--> 760 assert False, 'tsolve: at least one Function expected
at this point'
761
762 # perform the substitution
AssertionError: tsolve: at least one Function expected at this point
And after the patch:
In [1]: tsolve(1.0 + 2.0*x + 3.0*sqrt(1-x**2),x)
---------------------------------------------------------------------------
UnboundLocalError Traceback (most recent call last)
/home/ondra/repos/sympy/<ipython console> in <module>()
/home/ondra/repos/sympy/sympy/solvers/solvers.py in tsolve(eq, sym)
792 if cv_inv.is_Pow:
793 for sol in cv_sols:
--> 794 sols = sols +
solve(pow(sym,1/cv_inv.exp)-cv_inv.base.subs(t, sol),sym)
795 else:
796 for sol in cv_sols:
/home/ondra/repos/sympy/sympy/solvers/solvers.py in solve(f, *symbols,
**flags)
173 poly = f.as_poly( symbol )
174 assert poly is not None
--> 175 result = roots(poly, cubics=True, quartics=True).keys()
176
177 elif strategy == GS_RATIONAL:
/home/ondra/repos/sympy/sympy/polys/rootfinding.pyc in roots(f, *symbols,
**flags)
275
276 for i, h in enumerate(poly_sqf(g)):
--> 277 for zero in _roots(h):
278 if zeros.has_key(zero):
279 zeros[zero] += i+1
/home/ondra/repos/sympy/sympy/polys/rootfinding.pyc in _roots(g)
232 [factors] = poly_factors(g)[1:]
233
--> 234 if n > 1 and len(factors) != 1:
235 # extract first rational roots
236 # this decomposes the polynomial into polynomials of
UnboundLocalError: local variable 'factors' referenced before assignment
So that's probably related to the issue 1276.
If you figure out where the problem is with the git version is, it'd be
awesome. You
can use git bisect for that. Here is some info how to get started with git:
http://docs.sympy.org/sympy-patches-tutorial.html#quick-start
Attachments:
0001-Fixes-the-tsolve-1.0-2.0-x-3.0-sqrt-1-x-2-cj3.patch 2.5 KB
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