Hello, My name is Joseph Stradling and I am a junior chemical cngineering student transitioning into computer science at New Mexico Tech.
I am interested in improving the pattern matching and recognition as a project for Google Summer of Code. I am currently trying to determine which combination of possible project paths would be appropriately difficult and useful. I am currently leaning towards: - Expression complexity measures As I understand it, this is determining the complexity of regular expressions. This seems challenging but fairly straightforward, and it looks like there is pretty good literature on the subject - Expression tree similarity testing Basically make something to determine similarity in expression trees. It seems like something that can be solved with clever stacking, but I am probably missing a big piece of the challenge - Heuristic equivalence testing I assume this is just summing the two expressions and seeing if they add to zero. - Semantic matching To be perfectly honest, I have no idea how to do this cleverly. Possibly with the heuristic equivalence testing? Also it says: - implement semantic matching (e.g. expression: cos(x), pattern: sin(a*x) + b) - e.g by using power series for this purpose (improve series speed) I don't really know how I would go about using series for semantic matching. Bottom line: this seems very difficult and time consuming, but it could just be that I am pretty clueless about it. It seems pretty useful so I though it would be worth attempting Questions: What are expression signatures? Is there anything that has been recently done in this area? Is there a student already doing this? I looked over the group posts but I didn't see anything. Would this be enough to occupy the summer? I would appreciate any guidance. -Joseph Stradling Application and patch to follow :-) -- 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 sympy+unsubscr...@googlegroups.com. To post to this group, send email to sympy@googlegroups.com. Visit this group at http://groups.google.com/group/sympy?hl=en-US. For more options, visit https://groups.google.com/groups/opt_out.
