[yt-users] error "Zero-length selections are not allowed"

[Jean-Claude Passy]

Hi everyone,

I get an error when executing the simple script below:

------------------------------------------------------------------------------

from yt.mods import *

output = 'DD0010/data0010'

pf = load(output)

region = pf.h.region([0.5,0.5,0.5],[0.0,0.0,0.0],[1.0,1.0,1.0])

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I have pasted the output there: 
http://paste.yt-project.org/show/awqlzVK7mAhtiIVihFfC/
I think the problem is that my simulation has only 2 particles (no gas) 
and both particles are in subgrids so the root grid is empty:

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[19:46:54] Obiwan:$ h5ls DD0010/data0010.cpu0000

Grid00000001             Group

Grid00000002             Group

Metadata                 Group

[19:47:09] Obiwan:$ h5ls DD0010/data0010.cpu0000/Grid00000001

[19:47:15] Obiwan:$ h5ls DD0010/data0010.cpu0000/Grid00000002

particle_index           Dataset {2}

particle_mass            Dataset {2}

particle_position_x      Dataset {2}

particle_position_y      Dataset {2}

particle_position_z      Dataset {2}

particle_type            Dataset {2}

particle_velocity_x      Dataset {2}

particle_velocity_y      Dataset {2}

particle_velocity_z      Dataset {2}

------------------------------------------------------------------------------


I would really appreciate if someone could help me to fix this.
Thanks a lot,

JC
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