Exception when adding two layouts on matplotlib

[wjaskowski]

hv.extension('matplotlib')
def sin_curve(phase, freq):
    xvals = [0.1* i for i in range(100)]
    return hv.Curve((xvals, [np.sin(phase+freq*x) for x in xvals]))

def cos_curve(phase, freq):
    xvals = [0.1* i for i in range(100)]
    return hv.Curve((xvals, [np.sin(phase+freq*x) for x in xvals]))

phases      = [0, 1, 2]
frequencies = [0.5, 1.0, 1.5]
sin_curves = {(p,f):sin_curve(p,f) for p in phases for f in frequencies}
#del sin_curves[0, 1.0]
hmap_sin = hv.HoloMap(sin_curves, kdims=['phase', 'frequency'])

cos_curves = {(p,f):cos_curve(p,f) for p in phases for f in frequencies}
hmap_cos = hv.HoloMap(cos_curves, kdims=['phase', 'frequency'])

hmap_sin.layout(dimensions=['phase']) + hmap_cos.layout(dimensions=['phase'])

works fine with Bokeh but fails on Matplotlib:

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
/Users/Wojciech/miniconda3/envs/rlzoo/lib/python3.6/site-packages/IPython/core/formatters.py in __call__(self, obj)
    303                 pass
    304             else:
--> 305                 return printer(obj)
    306             # Finally look for special method names
    307             method = get_real_method(obj, self.print_method)

/Users/Wojciech/miniconda3/envs/rlzoo/lib/python3.6/site-packages/holoviews/ipython/display_hooks.py in pprint_display(obj)
    257     if not ip.display_formatter.formatters['text/plain'].pprint:
    258         return None
--> 259     return display(obj, raw=True)
    260 
    261 

/Users/Wojciech/miniconda3/envs/rlzoo/lib/python3.6/site-packages/holoviews/ipython/display_hooks.py in display(obj, raw, **kwargs)
    240     elif isinstance(obj, (Layout, NdLayout, AdjointLayout)):
    241         with option_state(obj):
--> 242             html = layout_display(obj)
    243     elif isinstance(obj, (HoloMap, DynamicMap)):
    244         with option_state(obj):

/Users/Wojciech/miniconda3/envs/rlzoo/lib/python3.6/site-packages/holoviews/ipython/display_hooks.py in wrapped(element)
    129         try:
    130             html = fn(element,
--> 131                       max_frames=OutputSettings.options['max_frames'])
    132 
    133             # Only want to add to the archive for one display hook...

/Users/Wojciech/miniconda3/envs/rlzoo/lib/python3.6/site-packages/holoviews/ipython/display_hooks.py in layout_display(layout, max_frames)
    211         return None
    212 
--> 213     return render(layout)
    214 
    215 

/Users/Wojciech/miniconda3/envs/rlzoo/lib/python3.6/site-packages/holoviews/ipython/display_hooks.py in render(obj, **kwargs)
     59     if renderer.fig == 'pdf':
     60         renderer = renderer.instance(fig='png')
---> 61     return renderer.html(obj, **kwargs)
     62 
     63 

/Users/Wojciech/miniconda3/envs/rlzoo/lib/python3.6/site-packages/holoviews/plotting/renderer.py in html(self, obj, fmt, css, comm, **kwargs)
    253         code to initialize a Comm, if the plot supplies one.
    254         """
--> 255         plot, fmt =  self._validate(obj, fmt)
    256         figdata, _ = self(plot, fmt, **kwargs)
    257         if css is None: css = self.css

/Users/Wojciech/miniconda3/envs/rlzoo/lib/python3.6/site-packages/holoviews/plotting/renderer.py in _validate(self, obj, fmt)
    189         if isinstance(obj, tuple(self.widgets.values())):
    190             return obj, 'html'
--> 191         plot = self.get_plot(obj, renderer=self)
    192 
    193         fig_formats = self.mode_formats['fig'][self.mode]

/Users/Wojciech/miniconda3/envs/rlzoo/lib/python3.6/site-packages/holoviews/plotting/renderer.py in get_plot(self_or_cls, obj, renderer)
    176             plot = self_or_cls.plotting_class(obj)(obj, renderer=renderer,
    177                                                    **plot_opts)
--> 178             plot.update(0)
    179         else:
    180             plot = obj

/Users/Wojciech/miniconda3/envs/rlzoo/lib/python3.6/site-packages/holoviews/plotting/mpl/plot.py in update(self, key)
    243         if len(self) == 1 and key == 0 and not self.drawn:
    244             return self.initialize_plot()
--> 245         return self.__getitem__(key)
    246 
    247 

/Users/Wojciech/miniconda3/envs/rlzoo/lib/python3.6/site-packages/holoviews/plotting/plot.py in __getitem__(self, frame)
    219         if isinstance(frame, int) and frame > len(self):
    220             self.warning("Showing last frame available: %d" % len(self))
--> 221         if not self.drawn: self.handles['fig'] = self.initialize_plot()
    222         if not isinstance(frame, tuple):
    223             frame = self.keys[frame]

/Users/Wojciech/miniconda3/envs/rlzoo/lib/python3.6/site-packages/holoviews/plotting/mpl/plot.py in wrapper(self, *args, **kwargs)
     41     def wrapper(self, *args, **kwargs):
     42         with _rc_context(self.fig_rcparams):
---> 43             return f(self, *args, **kwargs)
     44     return wrapper
     45 

/Users/Wojciech/miniconda3/envs/rlzoo/lib/python3.6/site-packages/holoviews/plotting/mpl/plot.py in initialize_plot(self)
   1067         ranges = self.compute_ranges(self.layout, key, None)
   1068         for subplot in self.subplots.values():
-> 1069             subplot.initialize_plot(ranges=ranges)
   1070 
   1071         # Create title handle

/Users/Wojciech/miniconda3/envs/rlzoo/lib/python3.6/site-packages/holoviews/plotting/mpl/plot.py in wrapper(self, *args, **kwargs)
     41     def wrapper(self, *args, **kwargs):
     42         with _rc_context(self.fig_rcparams):
---> 43             return f(self, *args, **kwargs)
     44     return wrapper
     45 

/Users/Wojciech/miniconda3/envs/rlzoo/lib/python3.6/site-packages/holoviews/plotting/mpl/plot.py in initialize_plot(self, ranges)
    639                 ax.set_axis_off()
    640                 continue
--> 641             subplot.initialize_plot(ranges=ranges)
    642 
    643         self.adjust_positions()

/Users/Wojciech/miniconda3/envs/rlzoo/lib/python3.6/site-packages/holoviews/plotting/mpl/plot.py in wrapper(self, *args, **kwargs)
     41     def wrapper(self, *args, **kwargs):
     42         with _rc_context(self.fig_rcparams):
---> 43             return f(self, *args, **kwargs)
     44     return wrapper
     45 

TypeError: initialize_plot() got an unexpected keyword argument 'ranges'

[jlstevens]

This is something Philipp and have disagreed about - the .layout method returns an NdLayout and therefore does not support the + operator of Layout. See #1606 for the discussion.

[wjaskowski]

NdLayout * NdLayout informs a user that this is disallowed but, as I have shown '+' works but only for Bokeh. So, something is wrong, anyway.

[jlstevens]

I agree. It is odd that it works for Bokeh, I don't think it should...

[github-actions]

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