GSoC 2020 - Week 6

Key highlights of this week’s work are:

• Fixed RecursionError and Timeout in limit evaluations

  • The Recursion Errors in limit evaluations were mainly due to the fact that the indeterminant form of 1**oo was not handled accurately in the mrv() function of the Gruntz algorithm. So, some minor changes were required to fix those.

    The major issue was to handle those cases which were timing out. On deep digging, we identified that the cancel() function of polytools.py was the reason. Thus, we decided to completely transform the cancel() function to speed up its algorithm. Now after this major modification, many testcases were failing as the cancel() function plays an important role in simplifying evaluations and is thus used at many places across the codebase. Therefore, a lot of time was spent in debugging and rectifying these testcases.

    Finally we were able to merge this, enhancing the limit evaluation capabilities of SymPy.