That is true that if you can replace indexes with a multiple argument
function. But an index is an integer not a real.
Furthermore the feature that makes indexed quantity behave just like a
numpy array is neat.
I think that when you manipulate a tensor/matrix field it would be nice be
be able to do algebra.
I also noticed that you cannot differentiate with respect to an indexed
value:
***************************************************
f = IndexedBase('f')
i = Idx('i')
diff(f[i]**2,f[i])
>> Can't differentiate wrt the variable: f[i], 1
****************************************************
So, I understand that the idea is pleasant. Someone willing to extend
indexes ? Otherwise, how can I help ? Do you have pointers to the ways
indexes are working ?
Thanks
Guillaume
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