[MOAB-dev] Questions about Tags and Topology

[Christopher Mueller]

Hi Jim,

Thank you very much for the sample code for data types.  This is perfect (and powerful) and should allow us to support all of the data types we'll need (including any "custom" ones).

Best,
Chris

From: James Porter <jvporter at wisc.edu<mailto:jvporter at wisc.edu>>
Date: Mon, 13 Feb 2012 15:46:06 -0500
To: Christopher Mueller <cmueller at asascience.com<mailto:cmueller at asascience.com>>
Cc: "moab-dev at mcs.anl.gov<mailto:moab-dev at mcs.anl.gov>" <moab-dev at mcs.anl.gov<mailto:moab-dev at mcs.anl.gov>>, Guy De Wardener <gdewardener at asascience.com<mailto:gdewardener at asascience.com>>, David Stuebe <DStuebe at asascience.com<mailto:DStuebe at asascience.com>>, "don.brittain at instanteffects.com<mailto:don.brittain at instanteffects.com>" <don.brittain at instanteffects.com<mailto:don.brittain at instanteffects.com>>
Subject: Re: [MOAB-dev] Questions about Tags and Topology

On Fri, 2012-02-10 at 17:28 -0500, Christopher Mueller wrote:
Hi Tim,
I've had a good deal of success this week and have been able to
represent a couple of our simpler datasets in what seems to be a
reasonable manner.  I have also come up with a few questions.
Tags:
       * DataTypes – from what I can see, tags do not support a few of
         the numpy datatypes, namely: float32, int16, and int64.  Is
         this a constraint of the PyTAPS wrapper or the underlying
         iMesh/MOAB infrastructure?

iMesh only supports a handful of types, but as mentioned, the bytes type
lets you convert to/from the type you actually want. Here are some
sample functions to do this:

def set_packed(tag, key, value):
    tag[key] = numpy.frombuffer(numpy.asarray(value), dtype=numpy.byte)

def get_packed(tag, key, dtype):
    return numpy.frombuffer(tag[key], dtype=dtype)

# In use:
set_packed(my_tag, my_entity, numpy.int16(300))
get_packed(my_tag, my_entity, numpy.int16)

- Jim


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