Is there a reason why matrices don't implement *_eval_diff*?
Elementwise derivatives are currently handled by the *diff* method.
Calling *matrix.diff(x)* calculates derivatives elementwisely, *diff(matrix,
x)* returns an unevaluated derivative.
In [12]: var('x y z')
Out[12]: (x, y, z)
In [13]: m = Matrix([[x, y], [x*y, x*z]])
In [14]: m.diff(x)
Out[14]:
Matrix([
[1, 0],
[y, z]])
In [15]: diff(m, x)
Out[15]:
Derivative(Matrix([
[ x, y],
[x*y, x*z]]), x)
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