[yt-svn] [yt_analysis/yt] Fix StreamHandler refine_by to support arrays (issue #385)

[astrofrog]

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New issue 385: Fix StreamHandler refine_by to support arrays
https://bitbucket.org/yt_analysis/yt/issue/385/fix-streamhandler-refine_by-to-support

astrofrog:

I am using the StreamHandler to specify a custom AMR grid to be visualized in yt, and I am setting the refine_by ratio with e.g.:

    
{{{
handler.refine_by = 2
}}}

Ideally, I would like this value to be a function of the level, e.g.

{{{
handler.refine_by = np.array([4,2,2,4])
}}}

for a 5-level AMR grid.

Looking at the yt code, it seems that some places allow for refine_by to
be an array, e.g. lines 370-373 in grid_patch.py:

{{{
try:
    rf = self.pf.refine_by[child.Level-1]
except TypeError:
    rf = self.pf.refine_by
}}}

but if I try and specify an array, I hit an error on line 133 of hiearchy.py:

{{{
if self.pf.refine_by != 2 and hasattr(self, 'proj') and \
}}}

which assumes refine_by is a scalar value. If I fix this (by only
testing if refine_by is a scalar), I run into an issue at

{{{
self.dds = self.Parent.dds / self.pf.refine_by
}}}

which also seems to assume that refine_by should be a scalar. Would it be possible to fix this so that refine_by can be set to an array?


Responsible: MatthewTurk
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