Comment #5 on issue 1211 by ondrej.certik: Getting a value of a function
does not work or is not possible
http://code.google.com/p/sympy/issues/detail?id=1211
Yes, you need to create a function, like:
In [1]: F = x**2
In [2]: from sympy.mpmath import quadts
In [3]: quadts(lambda t: F({x: t}).evalf(), [-1, 1])
---------------------------------------------------------------------------
TypeError Traceback (most recent call last)
/home/ondrej/repos/sympy/<ipython console> in <module>()
/home/ondrej/repos/sympy/sympy/mpmath/quadrature.pyc in quadts(*args,
**kwargs)
772 """
773 kwargs['method'] = TanhSinh
--> 774 return quad(*args, **kwargs)
775
776 def quadgl(*args, **kwargs):
/home/ondrej/repos/sympy/sympy/mpmath/quadrature.pyc in quad(f, *points,
**kwargs)
729 mp.prec += 20
730 if dim == 1:
--> 731 v, err = rule.summation(f, points[0], prec, epsilon, m,
verbose)
732 elif dim == 2:
733 v, err = rule.summation(lambda x: \
/home/ondrej/repos/sympy/sympy/mpmath/quadrature.pyc in summation(self, f,
points,
prec, epsilon, max_degree, verbose)
234 print "Integrating from %s to %s (degree %s
of %s)" % \
235 (nstr(a), nstr(b), degree, max_degree)
--> 236 results.append(self.sum_next(f, nodes, degree,
prec, results,
verbose))
237 if degree > 1:
238 err = self.estimate_error(results, prec,
epsilon)
/home/ondrej/repos/sympy/sympy/mpmath/quadrature.pyc in sum_next(self, f,
nodes,
degree, prec, previous, verbose)
306 else:
307 S = mpf(0)
--> 308 S += fdot((w,f(x)) for (x,w) in nodes)
309 return h*S
310
/home/ondrej/repos/sympy/sympy/mpmath/mptypes.pyc in fdot(A, B)
1168 for a, b in A:
1169 if type(a) not in types: a = mpmathify(a)
-> 1170 if type(b) not in types: b = mpmathify(b)
1171 a_real = hasattr_(a, "_mpf_")
1172 b_real = hasattr_(b, "_mpf_")
/home/ondrej/repos/sympy/sympy/mpmath/mptypes.pyc in mpmathify(x, strings)
99 if hasattr(x, '_mpmath_'):
100 return mpmathify(x._mpmath_(*prec_rounding))
--> 101 raise TypeError("cannot create mpf from " + repr(x))
102
103 def try_convert_mpf_value(x, prec, rounding):
TypeError: cannot create mpf from 0
that it doesn't work seems like a bug in mpmath.
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