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Scott Sanderson
6e8a4b8144
- Add an `ascending=True` keyword to `rank()`. - Add `top(N)` and `bottom(N)` methods to Factor. These return Filters that pass the top and bottom N elements each day. - Add a slightly faster path for rank(method='ordinal'). I had originally thought the fast path was 2-3x faster because I had my benchmark data axes flipped. The actual speedup is only 5-10%, which means it probably wasn't worth the effort to Cythonize...but we have a slightly faster version now so we might as well use it. - Refactor test_filter and test_factor to make it easier to implement and test transformations on factors. These tests now subclass BaseFFCTestCase, which provides facilities for passing a dict of terms and an "initial_workspace", the values for which are used by SimpleFFCEngine rather than needing to manually manage the inputs and outputs of each term.