I am unsure why the following piece of code doesn't work. I am using
sympy 0.7.5-git and IronPython 2.7.
import sympy
from sympy import *
x = Symbol('x')
formula = 2 * (x**3)
x_minimum = 0.0
x_maximum = 0.01
d = diff(formula, x)
print d
i = integrate(sqrt(1 + (d**2)), (x, x_minimum, x_maximum))
Running this outputs:
6*x**2
Traceback (most recent call last):
File "<string>", line 12, in <module>
File
"C:\Users\Andy\Documents\Script\PythonLib\site-packages\sympy\utilities\decorator.py",
line 35, in threaded_func
File
"C:\Users\Andy\Documents\Script\PythonLib\site-packages\sympy\integrals\meijerint.py",
line 1611, in _meijerint_indefinite_1
File
"C:\Users\Andy\Documents\Script\PythonLib\site-packages\sympy\core\basic.py",
line 1067, in fallback
File
"C:\Users\Andy\Documents\Script\PythonLib\site-packages\sympy\core\cache.py",
line 93, in wrapper
File
"C:\Users\Andy\Documents\Script\PythonLib\site-packages\sympy\core\function.py",
line 368, in __new__
File
"C:\Users\Andy\Documents\Script\PythonLib\site-packages\sympy\core\cache.py",
line 93, in wrapper
File
"C:\Users\Andy\Documents\Script\PythonLib\site-packages\sympy\core\function.py",
line 198, in __new__
File
"C:\Users\Andy\Documents\Script\PythonLib\site-packages\sympy\functions\elementary\exponential.py",
line 228, in eval
File
"C:\Users\Andy\Documents\Script\PythonLib\site-packages\sympy\integrals\integrals.py",
line 1288, in integrate
File
"C:\Users\Andy\Documents\Script\PythonLib\site-packages\sympy\integrals\integrals.py",
line 552, in doit
File
"C:\Users\Andy\Documents\Script\PythonLib\site-packages\sympy\integrals\integrals.py",
line 933, in _eval_integral
File
"C:\Users\Andy\Documents\Script\PythonLib\site-packages\sympy\integrals\meijerint.py",
line 1596, in meijerint_indefinite
File
"C:\Users\Andy\Documents\Script\PythonLib\site-packages\sympy\integrals\meijerint.py",
line 1548, in _rewrite1
File
"C:\Users\Andy\Documents\Script\PythonLib\site-packages\sympy\core\cache.py",
line 93, in wrapper
File
"C:\Users\Andy\Documents\Script\PythonLib\site-packages\sympy\integrals\meijerint.py",
line 1442, in _rewrite_single
File
"C:\Users\Andy\Documents\Script\PythonLib\site-packages\sympy\core\basic.py",
line 976, in subs
File
"C:\Users\Andy\Documents\Script\PythonLib\site-packages\sympy\core\cache.py",
line 93, in wrapper
File
"C:\Users\Andy\Documents\Script\PythonLib\site-packages\sympy\core\basic.py",
line 1090, in _subs
File
"C:\Users\Andy\Documents\Script\PythonLib\site-packages\sympy\core\basic.py",
line 1062, in fallback
File
"C:\Users\Andy\Documents\Script\PythonLib\site-packages\sympy\core\cache.py",
line 93, in wrapper
File
"C:\Users\Andy\Documents\Script\PythonLib\site-packages\sympy\core\basic.py",
line 1090, in _subs
File
"C:\Users\Andy\Documents\Script\PythonLib\site-packages\sympy\core\cache.py",
line 93, in wrapper
File
"C:\Users\Andy\Documents\Script\PythonLib\site-packages\sympy\core\function.py",
line 368, in __new__
File
"C:\Users\Andy\Documents\Script\PythonLib\site-packages\sympy\core\cache.py",
line 93, in wrapper
File
"C:\Users\Andy\Documents\Script\PythonLib\site-packages\sympy\core\function.py",
line 198, in __new__
File
"C:\Users\Andy\Documents\Script\PythonLib\site-packages\sympy\integrals\meijerint.py",
line 78, in eval
File
"C:\Users\Andy\Documents\Script\PythonLib\site-packages\sympy\simplify\simplify.py",
line 2221, in unpolarify
File
"C:\Users\Andy\Documents\Script\PythonLib\site-packages\sympy\simplify\simplify.py",
line 2177, in _unpolarify
File
"C:\Users\Andy\Documents\Script\PythonLib\site-packages\sympy\simplify\simplify.py",
line 2168, in _unpolarify
TypeError: unsupported operand type(s) for __mul__: 'ImaginaryUnit' and
'Infinity'
Changing the input formula to 2 * x**2 seems to work OK.
Any ideas what I am doing wrong? Thanks!
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