Hi, all-- I'm running into problems making phase objects. It looks like the error is in the color bar, and is similar to other errors I get when trying to use PlotCollections. The hash I'm on is 34b95297062b. I'm trying: pf = load(fname) pc = PlotCollection(pf,'c') phase=pc.add_phase_object(pf.h.all_data(),['CellMass', 'x-velocity','CellVolume'],weight=None) min/max are as follows: CellMass: [4.1e-12,1.5e-03] (30631133,) x-velocity: [-7.2e+01,5.5e+01] CellVolume: [1.45e-11,6.0e-08] Is there a more up-to-date manner to do this that doesn't use PlotCollection? Or is there something obvious that I'm missing? It seems to be choking in plot_types.py/__init_colorbar def __init_colorbar(self): temparray = np.ones((self.x_bins.size, self.y_bins.size)) self.norm = matplotlib.colors.Normalize() self.image = self._axes.pcolormesh(self.x_bins, self.y_bins, temparray, shading='flat', norm=self.norm, cmap=self.cmap, rasterized=True) self.colorbar = self._figure.colorbar(self.image, extend='neither', shrink=0.95, format="%0.2e" ) It looks like what's happening is figure.colorbar chokes on the fact that temparray is "ones", so the spacing between elements is zero. This is outside of my yt knowledge, though. Traceback (most recent call last): File "<stdin>", line 1, in <module> File "p14_phase_test.py", line 4, in <module> phase=pc.add_phase_object(pf.h.all_data(),['CellMass','x-velocity','CellVolume']) File "/nics/b/home/collins/local_2013_03_12/src/yt-hg/yt/visualization/plot_collection.py", line 1184, in add_phase_object figure=figure, axes=axes)) File "/nics/b/home/collins/local_2013_03_12/src/yt-hg/yt/visualization/plot_types.py", line 815, in __init__ self.__init_colorbar() File "/nics/b/home/collins/local_2013_03_12/src/yt-hg/yt/visualization/plot_types.py", line 834, in __init_colorbar format="%0.2e" ) File "/nics/b/home/collins/local_2013_03_12/lib/python2.7/site-packages/matplotlib/figure.py", line 1387, in colorbar cb = cbar.colorbar_factory(cax, mappable, **kw) File "/nics/b/home/collins/local_2013_03_12/lib/python2.7/site-packages/matplotlib/colorbar.py", line 1173, in colorbar_factory cb = Colorbar(cax, mappable, **kwargs) File "/nics/b/home/collins/local_2013_03_12/lib/python2.7/site-packages/matplotlib/colorbar.py", line 854, in __init__ ColorbarBase.__init__(self, ax, **kw) File "/nics/b/home/collins/local_2013_03_12/lib/python2.7/site-packages/matplotlib/colorbar.py", line 298, in __init__ self.draw_all() File "/nics/b/home/collins/local_2013_03_12/lib/python2.7/site-packages/matplotlib/colorbar.py", line 323, in draw_all self._config_axes(X, Y) File "/nics/b/home/collins/local_2013_03_12/lib/python2.7/site-packages/matplotlib/colorbar.py", line 409, in _config_axes self.update_ticks() File "/nics/b/home/collins/local_2013_03_12/lib/python2.7/site-packages/matplotlib/colorbar.py", line 345, in update_ticks ticks, ticklabels, offset_string = self._ticker() File "/nics/b/home/collins/local_2013_03_12/lib/python2.7/site-packages/matplotlib/colorbar.py", line 560, in _ticker ticks = self._locate(b) File "/nics/b/home/collins/local_2013_03_12/lib/python2.7/site-packages/matplotlib/colorbar.py", line 808, in _locate z = np.take(y, i0) + (xn-np.take(b,i0))*dy/db FloatingPointError: invalid value encountered in divide