#7570: Make plot methods accept 'empty' input to return empty Graphics object
------------------------+---------------------------------------------------
Reporter: chapoton | Owner: was
Type: defect | Status: needs_work
Priority: minor | Milestone:
Component: graphics | Keywords: list_plot, beginner
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
------------------------+---------------------------------------------------
Changes (by gagansekhon):
* status: needs_review => needs_work
Comment:
sage/plot/point.py fails.
When I passed an empty list I got an error.
sage: point([])
ERROR: An unexpected error occurred while tokenizing input
The following traceback may be corrupted or invalid
The error message is: ('EOF in multi-line statement', (273, 0))
---------------------------------------------------------------------------
ValueError Traceback (most recent call
last)
/Applications/sage4.6/devel/sage-main/<ipython console> in <module>()
/Applications/sage4.6/local/lib/python2.6/site-
packages/IPython/Prompts.pyc in __call__(self, arg)
549
550 # and now call a possibly user-defined print mechanism
--> 551 manipulated_val = self.display(arg)
552
553 # user display hooks can change the variable to be
stored in
/Applications/sage4.6/local/lib/python2.6/site-
packages/IPython/Prompts.pyc in _display(self, arg)
575 return IPython.generics.result_display(arg)
576 except TryNext:
--> 577 return self.shell.hooks.result_display(arg)
578
579 # Assign the default display method:
/Applications/sage4.6/local/lib/python2.6/site-packages/IPython/hooks.pyc
in __call__(self, *args, **kw)
139 #print "prio",prio,"cmd",cmd #dbg
140 try:
--> 141 ret = cmd(*args, **kw)
142 return ret
143 except ipapi.TryNext, exc:
/Applications/sage4.6/local/lib/python2.6/site-
packages/sage/misc/displayhook.pyc in result_display(ip_self, obj)
148 # IPython's default result_display() uses the
IPython.genutils.Term.cout stream.
149 # See also local/lib/python2.6/site-packages/IPython/hooks.py.
--> 150 print_obj(IPython.genutils.Term.cout, obj)
151
152 def displayhook(obj):
/Applications/sage4.6/local/lib/python2.6/site-
packages/sage/misc/displayhook.pyc in print_obj(out_stream, obj)
140 if _check_tall_list_and_print(out_stream, obj):
141 return
--> 142 print >>out_stream, `obj`
143
144 def result_display(ip_self, obj):
/Applications/sage4.6/local/lib/python2.6/site-
packages/sage/structure/sage_object.so in
sage.structure.sage_object.SageObject.__repr__
(sage/structure/sage_object.c:1341)()
/Applications/sage4.6/local/lib/python2.6/site-packages/sage/plot/plot.pyc
in _repr_(self)
1078 """
1079 if SHOW_DEFAULT:
-> 1080 self.show()
1081 return ''
1082 else:
/Applications/sage4.6/local/lib/python2.6/site-packages/sage/plot/misc.pyc
in wrapper(*args, **kwds)
82 kwds[self.name + "options"] = suboptions
83
---> 84 return func(*args, **kwds)
85
86 from sage.misc.sageinspect import sage_getsource
/Applications/sage4.6/local/lib/python2.6/site-packages/sage/plot/plot.pyc
in show(self, **kwds)
1737 if options['filename'] is None:
1738 options['filename'] =
sage.misc.misc.tmp_filename() + '.png'
-> 1739 self.save(**options)
1740 os.system('%s %s 2>/dev/null 1>/dev/null &' % \
1741 (sage.misc.viewer.browser(), options['filename']))
/Applications/sage4.6/local/lib/python2.6/site-packages/sage/plot/plot.pyc
in save(self, filename, dpi, savenow, *args, **kwds)
2386 options=dict()
2387 options['transparent']=kwds.pop('transparent',False)
-> 2388 figure=self.matplotlib(*args, **kwds)
2389 # You can output in PNG, PS, EPS, PDF, or SVG format,
depending on the file extension.
2390 # matplotlib looks at the file extension to see what
the renderer should be.
/Applications/sage4.6/local/lib/python2.6/site-packages/sage/plot/plot.pyc
in matplotlib(self, filename, xmin, xmax, ymin, ymax, figsize, figure,
sub, axes, axes_labels, fontsize, frame, verify, aspect_ratio, gridlines,
gridlinesstyle, vgridlinesstyle, hgridlinesstyle, show_legend,
legend_options, axes_pad, ticks_integer, tick_formatter, ticks)
1954 #add all the primitives to the subplot
1955 for g in self.__objects:
-> 1956 g._render_on_subplot(subplot)
1957
1958 #add the legend if requested
/Applications/sage4.6/local/lib/python2.6/site-
packages/sage/plot/point.pyc in _render_on_subplot(self, subplot)
271 scatteroptions={}
272 if not faceted: scatteroptions['edgecolors'] = 'none'
--> 273 subplot.scatter(self.xdata, self.ydata, s=s, c=c, alpha=a,
zorder=z, label=options['legend_label'], **scatteroptions)
274
275
/Applications/sage4.6/local/lib/python2.6/site-
packages/matplotlib/axes.pyc in scatter(self, x, y, s, c, marker, cmap,
norm, vmin, vmax, alpha, linewidths, faceted, verts, **kwargs)
5811 temp_y = y
5812
-> 5813 minx = np.amin(temp_x)
5814 maxx = np.amax(temp_x)
5815 miny = np.amin(temp_y)
/Applications/sage4.6/local/lib/python2.6/site-
packages/numpy/core/fromnumeric.pyc in amin(a, axis, out)
1641 except AttributeError:
1642 return _wrapit(a, 'min', axis, out)
-> 1643 return amin(axis, out)
1644
1645
ValueError: zero-size array to ufunc.reduce without identity
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/7570#comment:7>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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