> > *concerning sums: > *In [1]: s = summation(k**(-x),(k,1,oo)) > > In [2]: s > Out[2]: > > ∞ > ___ > \ ` > \ -x > / k > /__, > k = 1 > > In [3]: fs = lambdify([x], s) # I've added a print statement inside so I > can see the lambda string > lambda x: (Sum(k**(-x), (k, 1, oo))) > > In [4]: fs(2) > /usr/lib/pymodules/python2.7/numpy/__init__.pyc in <lambda>(x) > > NameError: global name 'Sum' is not defined > > > *concerning integrals:* > In [5]: expr = integrate(1/sqrt(x**2+x), (x, 1, y)) > > In [6]: func = lambdify([y], expr) > > In [7]: func(2) ValueError: Symbolic value, can't compute > > > Can somebody explain this to me, I'm looking at the code but I do not > understand why lambdify with mpmath and evalf are not reusing one another? >
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