Status: Accepted
Owner: asmeurer
Labels: Type-Defect Priority-Medium Matrices Printing
New issue 2653 by asmeurer: pretty printing an empty matrix is broken
http://code.google.com/p/sympy/issues/detail?id=2653
In [4]: a
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', (3, 0))
Out[4]:
---------------------------------------------------------------------------
ValueError Traceback (most recent call last)
/Users/aaronmeurer/Documents/python/sympy/sympy/<ipython-input-4-60b725f10c9c>
in
<module>()
----> 1 a
/Users/aaronmeurer/Documents/ipython/IPython/core/displayhook.pyc in
__call__(self, result)
300 self.start_displayhook()
301 self.write_output_prompt()
--> 302 format_dict = self.compute_format_data(result)
303 self.write_format_data(format_dict)
304 self.update_user_ns(result)
/Users/aaronmeurer/Documents/ipython/IPython/core/displayhook.pyc in
compute_format_data(self, result)
213 MIME type representation of the object.
214 """
--> 215 return self.shell.display_formatter.format(result)
216
217 def write_format_data(self, format_dict):
/Users/aaronmeurer/Documents/ipython/IPython/core/formatters.py in
format(self, obj, include, exclude)
123 continue
124 try:
--> 125 data = formatter(obj)
126 except:
127 # FIXME: log the exception
/Users/aaronmeurer/Documents/ipython/IPython/core/formatters.py in
__call__(self, obj)
444 type_pprinters=self.type_printers,
445 deferred_pprinters=self.deferred_printers)
--> 446 printer.pretty(obj)
447 printer.flush()
448 return stream.getvalue()
/Users/aaronmeurer/Documents/ipython/IPython/lib/pretty.pyc in pretty(self,
obj)
341 for cls in _get_mro(obj_class):
342 if cls in self.type_pprinters:
--> 343 return self.type_pprinters[cls](obj, self,
cycle)
344 else:
345 printer = self._in_deferred_types(cls)
/Users/aaronmeurer/Documents/python/sympy/sympy/sympy/interactive/printing.pyc
in
pretty_print(arg, p, cycle)
25 def pretty_print(arg, p, cycle):
26 """caller for pretty, for use in IPython 0.11"""
---> 27 p.text(stringify_func(arg))
28
29 def result_display(self, arg):
/Users/aaronmeurer/Documents/python/sympy/sympy/sympy/printing/pretty/pretty.pyc
in
pretty(expr, **settings)
1231
1232 try:
-> 1233 return pp.doprint(expr)
1234 finally:
1235 pretty_use_unicode(uflag)
/Users/aaronmeurer/Documents/python/sympy/sympy/sympy/printing/pretty/pretty.pyc
in
doprint(self, expr)
38
39 def doprint(self, expr):
---> 40 return self._print(expr).render(**self._settings)
41
42 # empty op so _print(stringPict) returns the same
/Users/aaronmeurer/Documents/python/sympy/sympy/sympy/printing/printer.pyc
in _print(self, expr, *args)
246 printmethod = '_print_' + cls.__name__
247 if hasattr(self, printmethod):
--> 248 return getattr(self, printmethod)(expr, *args)
249
250 # Unknown object, fall back to the emptyPrinter.
/Users/aaronmeurer/Documents/python/sympy/sympy/sympy/printing/pretty/pretty.pyc
in
_print_Matrix(self, e)
459
460 for j in range(M.cols):
--> 461 maxw[j] = max([Ms[i,j].width() for i in range(M.rows)])
462
463
ValueError: max() arg is an empty sequence
The string printer works just fine, though.
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