Comment #2 on issue 3975 by [email protected]: solve(floor (x)-5,x)
should not raise NotImplementedError
http://code.google.com/p/sympy/issues/detail?id=3975
My code is at https://github.com/torsknod/sympy-torsknod/tree/3975 .
I didn't hear anything about complex numbers and floor before I read the
following doctest in floor:
>>> floor(-I/2)
-I
If I understand the code right, floor is done separately for the real and
imaginary part. But I am not sure if the implementation of eval is more
than about complex number support.
Currently I have only implemented something for integer results which
returns an Interval. But this fails for the solve call given as
unfloor.eval() gets called with a Dummy as argument which has no/ empty
assumptions. I thought about trying to fix this in the solver.
Were would you put the rewrite and can you give me an example?
Thanks
Torsten
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