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<p>New issue 1197: YTPositionArray doesn't work <a href="https://bitbucket.org/yt_analysis/yt/issues/1197/ytpositionarray-doesnt-work">https://bitbucket.org/yt_analysis/yt/issues/1197/ytpositionarray-doesnt-work</a></p>

<p>Matthew Turk:</p>

<p>I don't think this is explicitly the fault of `YTArray`, but I don't know how to get around it.  Right now, creating a `yt.data_objects.octree_subset.YTPositionArray` just returns `YTArray`.  I'm not sure how to make sure that it returns the right class, but I suspect something in the `YTArray` code doesn't pass down subclasses.  (It used to, I promise!)</p>

<p>Here's example code:</p>

<p>``` import yt from yt.data_objects.octree_subset import YTPositionArray ds = yt.load("enzo_tiny_cosmology/DD0043/DD0043") pos = ds.r["particle_position"] ppos = YTPositionArray(pos) ```</p>

<p>At this point, `ppos` should have `to_octree` as a method, but it doesn't.  Not sure how to fix this — @ngoldbaum do you know how I could make sure that the subclass is correctly handled?</p>

<p>Responsible: MatthewTurk</p>


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