[yt-users] Streamlines error

[Caroline Van Borm]

Hi yt users,

I'm having a problem generating streamlines. I'm following the cookbook 
script and it works fine for the IsolatedGalaxy dataset, but not for my 
own data (also Enzo). The error I'm getting is the following:

    ---------------------------------------------------------------------------
    AttributeError                             Traceback (most recent call last)
    <ipython-input-20-d3a0fa7307d4>  in<module>()
           5  pos=  c+pos_dx
           6  
    ----> 7  streamlines  =  Streamlines(pf,pos,'x-velocity',  'y-velocity',  'z-velocity',  length=1.0)
           8  #streamlines = Streamlines(pf,pos,'x-velocity', 'y-velocity', 'z-velocity', length=pf.domain_width[0])
           9  streamlines.integrate_through_volume()

    /data/users/borm/YT/yt-x86_64/src/yt-hg/yt/visualization/streamlines.pyc  in__init__(self, pf, positions, xfield, yfield, zfield, volume, dx, length, direction, get_magnitude)
         102              volume = AMRKDTree(self.pf, fields=[self.xfield,self.yfield,self.zfield],
         103                              log_fields=[False,False,False])
    --> 104              volume.join_parallel_trees()
         105          self.volume=  volume
         106          if  dxis  None:

    /data/users/borm/YT/yt-x86_64/src/yt-hg/yt/utilities/amr_kdtree/amr_kdtree.pyc  injoin_parallel_trees(self)
         456          nid=  np.array(nid)
         457          new_tree = self.rebuild_tree_from_array(nid, pid, lid,
    --> 458              rid, les, res, gid, splitdims, splitposs)
         459  
         460      def  get_node_arrays(self):

    /data/users/borm/YT/yt-x86_64/src/yt-hg/yt/utilities/amr_kdtree/amr_kdtree.pyc  inrebuild_tree_from_array(self, nids, pids, lids, rids, les, res, gids, splitdims, splitposs)
         505          N=  nids.shape[0]
         506          for  iin  xrange(N):
    --> 507              n  =  self.get_node(nids[i])
         508              n.set_left_edge(les[i])
         509              n.set_right_edge(res[i])

    /data/users/borm/YT/yt-x86_64/src/yt-hg/yt/utilities/amr_kdtree/amr_kdtree.pyc  inget_node(self, nodeid)
         212          for  depthin  range(1,len(path)):
         213              if  path[depth]  ==  '0':
    --> 214                  temp  =  temp.left
         215              else:
         216                  temp=  temp.right

    AttributeError: 'NoneType' object has no attribute 'left'

Though sometimes with a different dataset I also get

    AttributeError: 'NoneType' object has no attribute 'right'

I'm using yt 2.6, but I've also tried with yt 3.1 and I get the same 
error there (only it takes much, much longer before it crashes?) My 
datasets do not have particles, not sure if that may be relevant.

Any help is much appreciated!

Cheers,
Caroline




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