[sage-devel] possible bug with manifolds

[Abhishek cherath]

I was following this 
<https://nbviewer.jupyter.org/github/sagemanifolds/SageManifolds/blob/master/Notebooks/SM_vector_calc_change.ipynb>
 
tutorial, and ran into issues with set_default_chart

 minimal example:

E.<r,th,ph> = EuclideanSpace(coordinates='spherical')
cartesian.<x,y,z> = E.cartesian_coordinates()
E.set_default_chart(cartesian)

error:

/home/abhishek/Applications/SageMath/local/lib/python3.7/site-packages/sage/manifolds/chart.py
 
in __call__(self, point) 531 532 """ --> 533 return point.coord(self) 534 
535 def domain(self): AttributeError: 'RealDiffChart' object has no 
attribute 'coord'

version: 
𝚂𝚊𝚐𝚎𝙼𝚊𝚝𝚑𝚟𝚎𝚛𝚜𝚒𝚘𝚗𝟿.𝟷,𝚁𝚎𝚕𝚎𝚊𝚜𝚎𝙳𝚊𝚝𝚎:𝟸𝟶𝟸𝟶⎯𝟶𝟻⎯𝟸𝟶
64bit.

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