derivatives of MatrixElements

[Jozef Vesely]

Hello,

I find this behaviour highly nonintuitive (buggy?).
I would like Out[3] and Out[4] to be 1 and 0 respectively.
Am I doing something wrong? Is there a workaround?

Regards

Jozef


In [1]: v=MatrixSymbol("v",5,1)

In [2]: diff(v[0]+v[1],v[0])
Out[2]: 1

In [3]: diff(v[0],v[0])
Out[3]:
 d      
────(v₀₀)
dv₀₀    

In [4]: diff(v[0],v[1])
Out[4]:
 d      
────(v₀₀)
dv₁₀    

In [5]: type(v[0])
Out[5]: sympy.matrices.expressions.matexpr.MatrixElement

[Aaron Meurer]

This has been fixed in SymPy master.

Aaron Meurer

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