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Considering for excample,

pl=implicit_plot3d((lambda x,y,z: x^2+y^2+z^2-1),\ (x,-1,1),(y,-1,1),(z,-1,1), plot_points=[10,10,10])

pl.triangulate()

Then,

pl.vertex_list() returns the vertex list and pl.index_faces() also work perfectly and returns the triangular faces. However,

pl.edge_list() retunrs the following error:

TypeError Traceback (most recent call last) <ipython-input-388-05ccc951c815> in <module> ----> 1 st.edge_list()

.. site-packages/sage/plot/plot3d/index_face_set.pyx in sage.plot.plot3d.index_face_set.IndexFaceSet.edge_list (build/cythonized/sage/plot/plot3d/index_face_set.c:9602)() 745 ((1.0, -2.0, 3.0), (1.0, 2.0, 3.0)) 746 """ --> 747 return list(self.edges()) 748 749 def vertices(self):

.. /site-packages/sage/plot/plot3d/index_face_set.pyx in sage.plot.plot3d.index_face_set.IndexFaceSet.edges (build/cythonized/sage/plot/plot3d/index_face_set.c:9522)() 732 ((1.0, -2.0, 3.0), (1.0, 2.0, 3.0)) 733 """ --> 734 return EdgeIter(self) 735 736 def edge_list(self):

... site-packages/sage/plot/plot3d/index_face_set.pyx in sage.plot.plot3d.index_face_set.EdgeIter.__init__ (build/cythonized/sage/plot/plot3d/index_face_set.c:21418)() 1735 self.set = face_set 1736 if not self.set.enclosed: -> 1737 raise TypeError("Must be closed to use the simple iterator.") 1738 self.i = 0 1739 self.j = 0

TypeError: Must be closed to use the simple iterator.

Considering for excample,example,

pl=implicit_plot3d((lambda x,y,z: x^2+y^2+z^2-1),\
    x^2+y^2+z^2-1),
            (x,-1,1),(y,-1,1),(z,-1,1), plot_points=[10,10,10])
 
pl.triangulate()
plot_points=[10,10,10])
pl.triangulate()

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-388-05ccc951c815> in <module>
----> 1 st.edge_list()
 
st.edge_list()

.. site-packages/sage/plot/plot3d/index_face_set.pyx in sage.plot.plot3d.index_face_set.IndexFaceSet.edge_list (build/cythonized/sage/plot/plot3d/index_face_set.c:9602)()
    745             ((1.0, -2.0, 3.0), (1.0, 2.0, 3.0))
    746         """
--> 747         return list(self.edges())
    748 
    749     def vertices(self):
 
vertices(self):

.. /site-packages/sage/plot/plot3d/index_face_set.pyx in sage.plot.plot3d.index_face_set.IndexFaceSet.edges (build/cythonized/sage/plot/plot3d/index_face_set.c:9522)()
    732             ((1.0, -2.0, 3.0), (1.0, 2.0, 3.0))
    733         """
--> 734         return EdgeIter(self)
    735 
    736     def edge_list(self):
 
edge_list(self):

 ... site-packages/sage/plot/plot3d/index_face_set.pyx in sage.plot.plot3d.index_face_set.EdgeIter.__init__ (build/cythonized/sage/plot/plot3d/index_face_set.c:21418)()
   1735         self.set = face_set
   1736         if not self.set.enclosed:
-> 1737             raise TypeError("Must be closed to use the simple iterator.")
   1738         self.i = 0
   1739         self.j = 0
 
0

TypeError: Must be closed to use the simple iterator.iterator.