valueerror when opening timestamps

[NileGraddis]

I'm looking at a running speed. Rendering the data works fine but the timestamps fail as follows:

---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
~/miniconda3/envs/py37/lib/python3.7/site-packages/ipywidgets/widgets/widget.py in _handle_msg(self, msg)
    667                 if 'buffer_paths' in data:
    668                     _put_buffers(state, data['buffer_paths'], msg['buffers'])
--> 669                 self.set_state(state)
    670 
    671         # Handle a state request.

~/miniconda3/envs/py37/lib/python3.7/site-packages/ipywidgets/widgets/widget.py in set_state(self, sync_data)
    537                     from_json = self.trait_metadata(name, 'from_json',
    538                                                     self._trait_from_json)
--> 539                     self.set_trait(name, from_json(sync_data[name], self))
    540 
    541     def send(self, content, buffers=None):

~/miniconda3/envs/py37/lib/python3.7/contextlib.py in __exit__(self, type, value, traceback)
    117         if type is None:
    118             try:
--> 119                 next(self.gen)
    120             except StopIteration:
    121                 return False

~/miniconda3/envs/py37/lib/python3.7/site-packages/traitlets/traitlets.py in hold_trait_notifications(self)
   1129                 for changes in cache.values():
   1130                     for change in changes:
-> 1131                         self.notify_change(change)
   1132 
   1133     def _notify_trait(self, name, old_value, new_value):

~/miniconda3/envs/py37/lib/python3.7/site-packages/ipywidgets/widgets/widget.py in notify_change(self, change)
    598                 # Send new state to front-end
    599                 self.send_state(key=name)
--> 600         super(Widget, self).notify_change(change)
    601 
    602     def __repr__(self):

~/miniconda3/envs/py37/lib/python3.7/site-packages/traitlets/traitlets.py in notify_change(self, change)
   1174                 c = getattr(self, c.name)
   1175 
-> 1176             c(change)
   1177 
   1178     def _add_notifiers(self, handler, name, type):

~/Desktop/nwb_janelia/nwb_jupyter/nwb-jupyter-widgets/nwbwidgets/view.py in on_selected_index(change)
     25     def on_selected_index(change):
     26         if change.new is not None and isinstance(change.owner.children[change.new], widgets.HTML):
---> 27             children[change.new] = nwb2widget(list(d.values())[change.new], neurodata_vis_spec=neurodata_vis_spec)
     28             change.owner.children = children
     29 

~/Desktop/nwb_janelia/nwb_jupyter/nwb-jupyter-widgets/nwbwidgets/view.py in nwb2widget(node, neurodata_vis_spec)
     90                 return tab
     91             elif callable(spec):
---> 92                 return vis2widget(spec(node, neurodata_vis_spec=neurodata_vis_spec))
     93     out1 = widgets.Output()
     94     with out1:

~/Desktop/nwb_janelia/nwb_jupyter/nwb-jupyter-widgets/nwbwidgets/base.py in show_timeseries(node, **kwargs)
     15     fig, ax = plt.subplots()
     16     if node.timestamps:
---> 17         ax.plot(node.timestamps, node.data)
     18     else:
     19         ax.plot(np.arange(len(node.data)) / node.rate + node.starting_time, node.data)

~/miniconda3/envs/py37/lib/python3.7/site-packages/matplotlib/__init__.py in inner(ax, data, *args, **kwargs)
   1808                         "the Matplotlib list!)" % (label_namer, func.__name__),
   1809                         RuntimeWarning, stacklevel=2)
-> 1810             return func(ax, *args, **kwargs)
   1811 
   1812         inner.__doc__ = _add_data_doc(inner.__doc__,

~/miniconda3/envs/py37/lib/python3.7/site-packages/matplotlib/axes/_axes.py in plot(self, scalex, scaley, *args, **kwargs)
   1609         kwargs = cbook.normalize_kwargs(kwargs, mlines.Line2D._alias_map)
   1610 
-> 1611         for line in self._get_lines(*args, **kwargs):
   1612             self.add_line(line)
   1613             lines.append(line)

~/miniconda3/envs/py37/lib/python3.7/site-packages/matplotlib/axes/_base.py in _grab_next_args(self, *args, **kwargs)
    391                 this += args[0],
    392                 args = args[1:]
--> 393             yield from self._plot_args(this, kwargs)
    394 
    395 

~/miniconda3/envs/py37/lib/python3.7/site-packages/matplotlib/axes/_base.py in _plot_args(self, tup, kwargs)
    351         # downstream.
    352         if any(v is None for v in tup):
--> 353             raise ValueError("x, y, and format string must not be None")
    354 
    355         kw = {}

ValueError: x, y, and format string must not be None

A two-axis plot of the timestamps doesn't really make sense anyways - they are just points in one dimension.

[bendichter]

I don't think you should have lone timestamps in your file in the first place