[yt-users] problem with covering_grid for Nyx data sets

[Wolfram Schmidt]

Hi,

I have got problem that concerns Nyx users and/or yt developers.

I want to read the root-grid level from AMR data sets with the following 
piece of code:


num_ghost_zones=2
left=na.amin(pf.h.grid_left_edge,axis=0)
right=na.amax(pf.h.grid_right_edge,axis=0)
resolution = (right-left)/pf.h.grids[0]['dx']+2*num_ghost_zones
cg = pf.h.covering_grid(0,left,resolution,num_ghost_zones=num_ghost_zones)


This works for Enzo data sets, but it fails for Nyx data sets. The error 
message is


Traceback (most recent call last):
   File "/home/h/nipiagws/scripts/spect_sb.py", line 52, in <module>
     cg = 
pf.h.covering_grid(0,left,resolution,num_ghost_zones=num_ghost_zones)
   File 
"/home/h/nipschul/yt-x86_64/src/yt-hg/yt/data_objects/data_containers.py", 
line 3727, in __init__
     self.dds = self.pf.domain_width/rdx.astype("float64")
AttributeError: 'list' object has no attribute 'astype'


The script used to work also for Nyx data sets, with an older version of 
yt (about a year ago).

How can this be fixed?

Thanks a lot,
Wolfram