bleearmstrong
commented
7 years ago I should add that this isn't actually a grouping issue, it's an index issue.
test = pd.DataFrame({'a': [1, 2, 3]}, index=['a', 'b', 'c'])
test >> mask(X.a > 0)
Empty DataFrame
Columns: [a]
Index: []This is fine after the fix.
test = pd.DataFrame({'a': [1, 2, 3]}, index=['a', 'b', 'c'])
test >> mask(X.a > 0)
a
a 1
b 2
c 3
kieferk
This PR is a fix for issue #24 (indexes weren't aligning correctly, so element-wise comparison was returning bad results)