Time for action – creating universal function

We can create a universal function from a Python function with the NumPy frompyfunc function, as follows:

1. Define a Python function that answers the ultimate question to the universe, existence, and the rest (it's from The Hitchhiker's Guide to the Galaxy; if you haven't read it, you can safely ignore this).

   def ultimate_answer(a):

   So far, nothing special; we gave the function the name ultimate_answer and defined one parameter, a.

2. Create a result consisting of all zeros, that has the same shape as a, with the zeros_like function:

   result = np.zeros_like(a)

3. Now set the elements of the initialized array to the answer 42 and return the result. The complete function should appear as shown, in the following code snippet. The flat attribute gives us access to a flat iterator that allows us to set the value of the array:

   def ultimate_answer(a):
      result = np.zeros_like(a)
      result.flat = 42
      return result

4. Create a universal function with frompyfunc; specify...