User Portlet User Portlet

Discussions
I first assign a symbolic value to an indexed variable Subscript[v, i ] How can I later clear this assignment ? I tried unsuccessfully with Clear and ClearAll. In[110]:= Subscript[v, i ]= i ^2 Out[110]= i^2 In[111]:= Subscript[v,...
Is there a reason why CoordinateTransform["Cartesian" -> "Polar", ... ] generates the polar coordinates in the order {Norm,Angle} while ... ListPolarPlot expects the coordinates in the reverse order ?