Status: New
Owner: ----
Labels: Type-Defect Priority-Low
New issue 3591 by [email protected]: 'no ordering relation is defined
for complex numbers' raised when plotting function involving Max(..)
http://code.google.com/p/sympy/issues/detail?id=3591
doing the following:
from sympy import *
x = Symbol('x', real = True)
plot(Max(x,5), (x,0,10))
raises the following exception:
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/sympy/plotting/plot.py",
line 1165, in plot
plots.show()
File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/sympy/plotting/plot.py",
line 193, in show
self._backend.show()
File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/sympy/plotting/plot.py",
line 946, in show
self.process_series()
File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/sympy/plotting/plot.py",
line 838, in process_series
collection = LineCollection(s.get_segments())
File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/sympy/plotting/plot.py",
line 461, in get_segments
f_start = f(self.start)
File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/sympy/plotting/experimental_lambdify.py",
line 204, in __call__
result = self.lambda_func(args)
File "<string>", line 1, in <lambda>
TypeError: no ordering relation is defined for complex numbers
while the following works:
plot(re(Max(x,5)), (x,0,10))
See also https://groups.google.com/d/topic/sympy/nmOUXi4qNao/discussion .
(the platform is OSX 10.7.5, python 2.7.3, sympy 0.7.2)
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