Hi Aaron, I opened on issue on github (https://github.com/sympy/sympy/issues/8155)
Dario On Wednesday, October 1, 2014 1:22:43 AM UTC+1, Aaron Meurer wrote: > > This looks like a bug. Can you open an issue for it? > > Aaron Meurer > > On Sun, Sep 28, 2014 at 1:46 PM, Dario Beraldi <[email protected] > <javascript:>> wrote: > > Hello, > > > > First: Thanks for developing sympy! > > > > I'm getting the error below, using sympy 0.7.5 on python 2.7.8, MacOS > 10.6. > > Could anyone explain what I'm doing wrong? > > > > Many thanks! > > Dario > > > > > > > > import sympy as s > > > > x= s.Symbol('x') > > y= 2*s.sin(x) - 2*s.sin(2*x) > > s.solve(y) > > > > Traceback (most recent call last): > > File "<stdin>", line 1, in <module> > > File > > > "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/sympy/solvers/solvers.py", > > > > line 901, in solve > > solution = _solve(f[0], *symbols, **flags) > > File > > > "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/sympy/solvers/solvers.py", > > > > line 1289, in _solve > > return _solve(newf, symbol, **flags) > > File > > > "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/sympy/solvers/solvers.py", > > > > line 1289, in _solve > > return _solve(newf, symbol, **flags) > > File > > > "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/sympy/solvers/solvers.py", > > > > line 1397, in _solve > > result = _tsolve(f_num, symbol, **flags) > > File > > > "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/sympy/solvers/solvers.py", > > > > line 2279, in _tsolve > > return _solve(f, sym, **flags) > > File > > > "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/sympy/solvers/solvers.py", > > > > line 1147, in _solve > > soln = _solve(m, symbol, **flags) > > File > > > "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/sympy/solvers/solvers.py", > > > > line 1397, in _solve > > result = _tsolve(f_num, symbol, **flags) > > File > > > "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/sympy/solvers/solvers.py", > > > > line 2320, in _tsolve > > return _solve(rewrite - rhs, sym, **flags) > > File > > > "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/sympy/solvers/solvers.py", > > > > line 1418, in _solve > > for den in dens)] > > File > > > "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/sympy/solvers/solvers.py", > > > > line 1418, in <genexpr> > > for den in dens)] > > File > > > "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/sympy/solvers/solvers.py", > > > > line 285, in checksol > > return abs(val.n(18).n(12, chop=True)) < 1e-9 > > File > > > "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/sympy/core/evalf.py", > > > > line 1284, in evalf > > result = evalf(self, prec + 4, options) > > File > > > "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/sympy/core/evalf.py", > > > > line 1184, in evalf > > r = rf(x, prec, options) > > File > > > "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/sympy/core/evalf.py", > > > > line 457, in evalf_add > > terms = [evalf(arg, prec + 10, options) for arg in v.args] > > File > > > "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/sympy/core/evalf.py", > > > > line 1184, in evalf > > r = rf(x, prec, options) > > File > > > "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/sympy/core/evalf.py", > > > > line 615, in evalf_pow > > re, im, re_acc, im_acc = evalf(base, prec + 5, options) > > File > > > "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/sympy/core/evalf.py", > > > > line 1190, in evalf > > re, im = x._eval_evalf(prec).as_real_imag() > > File > > > "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/sympy/polys/rootoftools.py", > > > > line 425, in _eval_evalf > > root = findroot(func, x0) > > File > > > "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/sympy/mpmath/calculus/optimization.py", > > > > line 931, in findroot > > fx = f(x0[0]) > > File "<string>", line 1, in <lambda> > > File > > > "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/sympy/core/expr.py", > > > > line 207, in __float__ > > raise TypeError("can't convert expression to float") > > TypeError: can't convert expression to float > > > > > > > > -- > > You received this message because you are subscribed to the Google > Groups > > "sympy" group. > > To unsubscribe from this group and stop receiving emails from it, send > an > > email to [email protected] <javascript:>. > > To post to this group, send email to [email protected] > <javascript:>. > > Visit this group at http://groups.google.com/group/sympy. > > To view this discussion on the web visit > > > https://groups.google.com/d/msgid/sympy/703e3b84-3103-4d7a-9028-ab7576ccde59%40googlegroups.com. > > > > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "sympy" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/sympy. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/1c0fc60e-3890-467d-8d9b-6354427b5689%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
