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
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