Comment #1 on issue 3490 by [email protected]: stats.Normal not taking symbolic standard deviation (wants 'positive')
http://code.google.com/p/sympy/issues/detail?id=3490
Define your symbol representing the standard deviation as positive:
from sympy import stats, Symbol from sympy.abc import m s = Symbol('s', positive=True) stats.Normal('x', m, s)
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