Apart from stats module, few more tests are Failing: https://travis-ci.org/sympy/sympy/builds/67354711
-- AMiT Kumar On Sunday, June 21, 2015 at 1:58:02 AM UTC+5:30, Aaron Meurer wrote: > > What exactly fails in the stats module? > > My guess is that the sets module will need to be able to have two > modes of operation, one which is very cautious about equality and > doesn't implicitly assume that a != b, and one which is very naive > about equality. The former is more mathematically rigorous, but can > result in unwieldy expressions, which could end up being useless. > Perhaps you are right that the less rigorous case can just be handled > by Python sets, which already consider equality structurally only. > > Aaron Meurer > > On Sat, Jun 20, 2015 at 1:22 PM, Harsh Gupta <[email protected] > <javascript:>> wrote: > > For the new solveset module we are using the SymPy set object to > represent a > > solution. So `solveset(x**2 - 1, x)` returns `{-1, 1}` and > `solveset(x**2 - a, > > x)` returns `{-a, a}` where `a` is a symbol and stands for some > parameter and > > `{-a, a}` is a FiniteSet object (from the sets module). With such sets > sometimes > > we encounter operations like the intersection of {a} and {b} where both > `a` and > > `b` are symbols. The current behavior of SymPy is to return an EmptySet > because > > `a` is not equal to `b` but in context of solveset it doesn't make sense > to > > return EmptySet because `a` and `b` are not values but they stand for > some value > > and it is possible that they will acquire the same value at some later > time. > > Hence, our plan is to always return an evaluated Intersection object > when the > > set contains symbols, but this behavior is causing some code to break in > the > > stats module. The issue can be solved by using python sets instead of > FiniteSet > > in the code using this functionality and other less preferred option is > to add > > some flag like `evaluate_symbols` so that people/modules can continue to > use the > > previous functionality. I want to have an opinion of people using the > set > > module. > > > > > > -- > > Harsh > > > > -- > > You received this message because you are subscribed to the Google > Groups "sympy" group. > > To unsubscribe from this group and stop receiving emails from it, send > an email to [email protected] <javascript:>. > > To post to this group, send email to [email protected] > <javascript:>. > > Visit this group at http://groups.google.com/group/sympy. > > To view this discussion on the web visit > https://groups.google.com/d/msgid/sympy/CADN8iurEUQFmrt9csBZFdkvUymwOjeC83jiejrsuKkBXMUNiVg%40mail.gmail.com. > > > > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "sympy" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/sympy. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/db9a12e3-b2b3-4afa-a497-11f7bc86c005%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
