title: What is the most idiomatic way to index an object with a boolean array in pandas?
body: <p>I am particularly talking about Pandas version 0.11 as I am busy replacing my uses of .ix with either .loc or .iloc. I like the fact that differentiating between .loc and .iloc communicates whether I am intending to index by label or integer position. I see that either one will accept a boolean array as well but I would like to keep their usage pure to clearly communicate my intent.</p>