This is even a more interesting example:
sage: f(x,y) = x+y
sage: Matrix(2, 2, f) # Matrix over CallableSymbolicExpressionRing
[(x, y) |--> x + y (x, y) |--> 0]
[ (x, y) |--> 0 (x, y) |--> x + y]
Here is a proposal (assuming callable(f) is true):
if not isinstance(f, RingElement):
treat f as function
elif we were called as Matrix(R, ...) with a ring R:
if f in R:
return f*identity matrix
else:
treat f as function
else:
deprecation(...)
return f*identity matrix
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