Hi all,

I am trying to figure out why I cannot do the following anymore with sympy 
0.7.3 while I could with sympy 0.7.2 : 


A = MAtrixSymbol('A','d',1)
xpr = A[3,0] * A[0,0] * 6
xpr.diff(A[0,0]) 

returns 6*A30 in sympy 0.7.2 but returns can't differentiate with respect 
to A[0,0]

How can I do the same thing with sympy 0.7.3 ?

Thanks,

Cheers,

F. 

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