Hi Jason,I had trouble with Flash particles last year, and John ZuHone fixed the bug. Could you try the newest yt3 and see if the problem goes away?YuanOn Tue, Apr 28, 2015 at 2:53 PM, Jason Galyardt <jason.galyardt@gmail.com> wrote:JasonNathan,I'm using yt version 3.0.2 (which I see is not quite current) on Debian 7 (wheezy). I tried to pastebin the iPython error traceback, but it failed with a complaint that the MySQL server has 'gone away'. With apologies to the list, here's the traceback:
---------------------------------------------------------------------------
ValueError Traceback (most recent call last)
<ipython-input-49-3f118016da60> in <module>()
----> 1 p.annotate_particles((4.0,'kpc'))
/usr/local/lib/python2.7/dist-packages/yt/visualization/plot_container.pyc in newfunc(*args, **kwargs)
68 rv = f(*args, **kwargs)
69 args[0]._plot_valid = False
---> 70 args[0]._setup_plots()
71 return rv
72 return newfunc
/usr/local/lib/python2.7/dist-packages/yt/visualization/plot_window.pyc in _setup_plots(self)
860 label.set_fontproperties(fp)
861
--> 862 self.run_callbacks(f)
863
864 if draw_axes is False:
/usr/local/lib/python2.7/dist-packages/yt/visualization/plot_container.pyc in run_callbacks(self, f)
313 CallbackMaker = callback_registry[name]
314 callback = CallbackMaker(*args[1:], **kwargs)
--> 315 callback(cbw)
316 for key in self.frb.keys():
317 if key not in keys:
/usr/local/lib/python2.7/dist-packages/yt/visualization/plot_modifications.pyc in __call__(self, plot)
1053 pt = self.ptype
1054 gg = ( ( reg[pt, field_x] >= x0 ) & ( reg[pt, field_x] <= x1 )
-> 1055 & ( reg[pt, field_y] >= y0 ) & ( reg[pt, field_y] <= y1 ) )
1056 if self.minimum_mass is not None:
1057 gg &= (reg[pt, "particle_mass"] >= self.minimum_mass)
/usr/local/lib/python2.7/dist-packages/yt/data_objects/data_containers.pyc in __getitem__(self, key)
238 return self.field_data[f]
239 else:
--> 240 self.get_data(f)
241 # fi.units is the unit expression string. We depend on the registry
242 # hanging off the dataset to define this unit object.
/usr/local/lib/python2.7/dist-packages/yt/data_objects/data_containers.pyc in get_data(self, fields)
665
666 read_particles, gen_particles = self.index._read_particle_fields(
--> 667 particles, self, self._current_chunk)
668 for f, v in read_particles.items():
669 self.field_data[f] = self.ds.arr(v, input_units = finfos[f].units)
/usr/local/lib/python2.7/dist-packages/yt/geometry/geometry_handler.pyc in _read_particle_fields(self, fields, dobj, chunk)
232 self._chunk_io(dobj, cache = False),
233 selector,
--> 234 fields_to_read)
235 return fields_to_return, fields_to_generate
236
/usr/local/lib/python2.7/dist-packages/yt/utilities/io_handler.pyc in _read_particle_selection(self, chunks, selector, fields)
148 # Here, ptype_map means which particles contribute to a given type.
149 # And ptf is the actual fields from disk to read.
--> 150 psize = self._count_particles_chunks(chunks, ptf, selector)
151 # Now we allocate
152 # ptf, remember, is our mapping of what we want to read
/usr/local/lib/python2.7/dist-packages/yt/utilities/io_handler.pyc in _count_particles_chunks(self, chunks, ptf, selector)
119 def _count_particles_chunks(self, chunks, ptf, selector):
120 psize = defaultdict(lambda: 0) # COUNT PTYPES ON DISK
--> 121 for ptype, (x, y, z) in self._read_particle_coords(chunks, ptf):
122 psize[ptype] += selector.count_points(x, y, z, 0.0)
123 return dict(psize.items())
/usr/local/lib/python2.7/dist-packages/yt/frontends/flash/io.pyc in _read_particle_coords(self, chunks, ptf)
72 start = p_ind[g1.id - g1._id_offset]
73 end = p_ind[g2.id - g2._id_offset + 1]
---> 74 x = np.asarray(p_fields[start:end, px], dtype="=f8")
75 y = np.asarray(p_fields[start:end, py], dtype="=f8")
76 z = np.asarray(p_fields[start:end, pz], dtype="=f8")
/usr/lib/python2.7/dist-packages/h5py/_hl/dataset.pyc in __getitem__(self, args)
312
313 # Perform the dataspace selection.
--> 314 selection = sel.select(self.shape, args, dsid=self.id)
315
316 if selection.nselect == 0:
/usr/lib/python2.7/dist-packages/h5py/_hl/selections.pyc in select(shape, args, dsid)
92
93 sel = SimpleSelection(shape)
---> 94 sel[args]
95 return sel
96
/usr/lib/python2.7/dist-packages/h5py/_hl/selections.pyc in __getitem__(self, args)
259 return self
260
--> 261 start, count, step, scalar = _handle_simple(self.shape,args)
262
263 self._id.select_hyperslab(start, count, step)
/usr/lib/python2.7/dist-packages/h5py/_hl/selections.pyc in _handle_simple(shape, args)
510 for arg, length in zip(args, shape):
511 if isinstance(arg, slice):
--> 512 x,y,z = _translate_slice(arg, length)
513 s = False
514 else:
/usr/lib/python2.7/dist-packages/h5py/_hl/selections.pyc in _translate_slice(exp, length)
551 raise ValueError("Step must be >= 1 (got %d)" % step)
552 if stop == start:
--> 553 raise ValueError("Zero-length selections are not allowed")
554 if stop < start:
555 raise ValueError("Reverse-order selections are not allowed")
ValueError: Zero-length selections are not allowed
------------------------------------------------------------------------Let me know if any other info would be useful.Cheers,On Tue, Apr 28, 2015 at 2:39 PM, Nathan Goldbaum <nathan12343@gmail.com> wrote:On Tue, Apr 28, 2015 at 11:37 AM, Nathan Goldbaum <nathan12343@gmail.com> wrote:On Tue, Apr 28, 2015 at 11:36 AM, Jason Galyardt <jason.galyardt@gmail.com> wrote:p = yt.ProjectionPlot(ds, "y", "density")However, when I try to create a projection and annotate the particles withHi all,I'm sure I've just overlooked some bit of documentation, but I'm having trouble plotting particles generated by FLASH on top of the gas density. I've been able to load a plot file with the associated particle file via
ds = yt.load(plotfileName, particle_filename=partfileName)
p.annotate_particles(1.0) # ValueError!# p.annotate_particles((4.0, 'kpc')) # ValueError!Can you pastebin the full error traceback? Which yt version are you using?Forgot to mention that you can get precise version information by executing "yt version" at the bash command line.Department of Physics and AstronomyJason GalyardtI get a ValueError from h5py indicating that zero-length selections are not allowed. I have also tried passing the full width of the simulation domain to the annotation function without success. I suspect that this is a user error stemming from differences between the way that Enzo and FLASH store particle data. However, I can't find much in the way of documentation or examples for the FLASH particle data format.Thanks,
Of course, it would also be handy to be able to write my own analysis scripts using both gas and particles, but for now, I'll settle for any help I can get on simple plotting functionality.University of Georgia
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