Hello all, I discovered sympy recently, and am very impressed. It does almost everything I need (and way more besides).
I'm making a start on removing the auto-distribution of constants (which is apparently an old issue, referred to at http://code.google.com/p/sympy/issues/detail?id=1497 and http://groups.google.com/group/sympy/browse_thread/thread/32bbf03c1bd922aa/a6557f077e3b2df1? among other places). So far, I'm going through the failed tests, and fixing the trivial ones (by trivial I mean that the expected behavior has changed, so Rational(1,2)*(x+y) should return (x+y)/2, not x/2 + y/2), and classifying the others. The good news is that the non-trivial ones are falling neatly into three categories so far, so there hopefully won't be too many actual changes to make. But there a couple of bugs that have me baffled. For example: test_subs_dict1 in sympy/core/tests/test_subs. c2,c3,q1p,q2p,c1,s1,s2,s3= symbols('c2 c3 q1p q2p c1 s1 s2 s3') test=c2**2*q2p*c3 + c1**2*s2**2*q2p*c3 + s1**2*s2**2*q2p*c3 \ - c1**2*q1p*c2*s3 - s1**2*q1p*c2*s3 assert test.subs({c1**2 : 1-s1**2, c2**2 : 1-s2**2, c3**3: 1- s3**2}) \ == c3*q2p*(1 - s2**2) + c3*q2p*s2**2*(1 - s1**2) - c2*q1p*s3*(1 - s1**2) \ + c3*q2p*s1**2*s2**2 - c2*q1p*s3*s1**2 If I create the necessary symbols, and enter test.subs({c1**2 : 1-s1**2, c2**2 : 1-s2**2, c3**3: 1-s3**2}) I get back c3*q2p*(1 - s2**2) + c3*q2p*s2**2*(1 - s1**2) - c2*q1p*s3*(1 - s1**2) + c3*q2p*s1**2*s2**2 - c2*q1p*s3*s1**2 Which is all well and good. But if I then copy and paste these to get test.subs({c1**2 : 1-s1**2, c2**2 : 1-s2**2, c3**3: 1-s3**2}) == c3*q2p*(1 - s2**2) + c3*q2p*s2**2*(1 - s1**2) - c2*q1p*s3*(1 - s1**2) + c3*q2p*s1**2*s2**2 - c2*q1p*s3*s1**2 It returns False. Does anyone have any clue how that could happen? I'm starting to pull my hair out over this. Thanks in advance, Kate -- You received this message because you are subscribed to the Google Groups "sympy" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/sympy?hl=en.
