Comment #10 on issue 2233 by gdrummo...@gmail.com: Triangle errors
http://code.google.com/p/sympy/issues/detail?id=2233

Cloned your repository, checked-out branch geometry. But it is still possible to create a Triangle from three collinear points.


gdk@JOBBY ~/My Documents/computing/__git__/sympy_smichr (geometry)
$ python bin/isympy
IPython console for SymPy 0.6.7-git (Python 2.7.1)

These commands were executed:
...[edited out]

In [1]: p1, p2, p3 = Point(0, 0), Point(1, 1), Point(2, 2)

In [2]: t = Triangle(p1, p2, p3)

In [4]: print t
------> print(t)
Triangle(Point(0, 0), Point(1, 1), Point(2, 2))

In [5]: t.circumcenter
---------------------------------------------------------------------------
IndexError                                Traceback (most recent call last)

c:\Documents and Settings\gdk\My Documents\computing\__git__\sympy_smichr\<ipyth
on console> in <module>()

c:\Documents and Settings\gdk\My Documents\computing\__git__\sympy_smichr\sympy\
geometry\polygon.pyc in circumcenter(self)
    963         """
    964         a,b,c = [x.perpendicular_bisector() for x in self.sides]
--> 965         return GeometryEntity.do_intersection(a, b)[0]
    966
    967     @property

IndexError: list index out of range

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