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Define a pure function delta that takes a function f as an argument and computes the forward difference of f . The mathematical definition of
Define a pure function delta that takes a function f as an argument and computes the forward difference of f The mathematical definition of the forward difference operator, written
Delta
is
Delta
f
x
f
x
f
x
Note that the argument f is a function, as is the value returned by delta. That is delta is a higherorder function. You will want to use a lambda expression in your solution.
The following fact may help you test your implementation:
For all numbers ndelta lambda x x n should be equal to why In scheme
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