Hi all,
I'm new to sympy and I found a strange behaviour that I'm not able to
understand, probably I'm doing something wrong...
:-)
{{{
In [1]: from sympy import symbols
In [2]: xa, ya, xb, yb = symbols('xa ya yb yb')
In [3]: yk = ya + yb
In [4]: yk.subs([(xa, 0), (ya, 4), (xb, 2), (yb, 4)])
Out[4]: 6
In [5]: yk.subs([(xa, 0), (ya, 4), (xb, 0), (yb, 4)])
Out[4]: 4
In [6]: yk.subs([(ya, 4), (yb, 4)])
Out[5]: 8
In [7]: import sympy
In [8]: sympy.__version__
Out[7]: '0.7.3'
}}}
Why the result is changing from line 4 to line 6? The variable xa and xb
are not used in the equation at line 3, but they changed the result... I'm
confused..
Any hints?
Pietro
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