I might be missing something, but can't we just reshape/transform the array from GDF into the format yt wants?

John ZuHone
Laboratory for High-Energy Astrophysics
NASA/Goddard Space Flight Center
8800 Greenbelt Rd., Mail Code 662
Greenbelt, MD 20771
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john.zuhone@nasa.gov
jzuhone@gmail.com

On Jan 29, 2014, at 5:22 PM, j s oishi <jsoishi@gmail.com> wrote:

Hi all,

I've adapted yt's gdf_writer.py into a standalone class called pygdf (https://bitbucket.org/jsoishi/pygdf). I've done this so that any python code can now save data in the gdf format. 

While doing this, I came across something in the yt gdf frontend that I'm not quite sure I understand. In the grid metadata, yt expects /grid_particle_count to be a 2-D array, but the gdf standard clearly states this should be a 1-D (int64, N) array, where N is the number of grids. Further complicating the issue is the fact that if I create a 1-D array for /grid_particle_count, the failure point in the following script

from yt.mods import *
pf = load("/tmp/blah.gdf")

sp = SlicePlot(pf, 2, "Density")

is actually in data_objects/grid_patch.py, not in the gdf frontend itself. The file /tmp/blah.gdf can be generated by running the test.py script in pygdf.

The obvious workaround is to simply make /grid_particle_count a 2D array (this is especially so since I'm not actually using particles at the moment), but I'm not sure why this should be so. The total count of particles in N grids seems to be better fit in a 1-D array to me. However, I'd like to understand better what's going on. Any pointers or clarification would be very helpful.

Also, any feedback on pygdf would be most welcome!

thanks,

j
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