Dear newsgroup,
I am trying to generate common sub expressions from an equation, but
the results are incorrect for negative values of the symbols.
An example (sympy 0.6.7)
x1=Symbol('x1')
x2=Symbol('x2')
y1=Symbol('y1')
z=Symbol('z', negative=True)
eq=x1*(1+ y1*(x1**2/z**2+x2**2/z**2))/z
v1,v2=cse(eq)
print(eq)
print(v1)
print(v2)
For x1=1, x2=1, y1=0 and z=-1 the original equation and the value of
the cse expression yield different values.
Is this a bug in cse, or can I make certain assumptions on the symbols
to generate correct expressions?
With kind regards,
Pieter Eendebak
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