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Solved and tested numpy_questions.py #895

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23 changes: 20 additions & 3 deletions numpy_questions.py
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Original file line number Diff line number Diff line change
Expand Up @@ -40,9 +40,19 @@ def max_index(X):
i = 0
j = 0

# TODO
if not isinstance(X, np.ndarray):
raise ValueError("Input is not a numpy array")
if not len(X.shape) == 2:
raise ValueError("Input is not a 2D array")

return i, j
i, j = np.unravel_index(np.argmax(X), X.shape)
# I tried using np.where first but it only returns a tuple of arrays,
# not integers.
# So used np.argmax instead which returns the index of the maximum
# as if it where flattened, so unravel is used to convert that index
# back to 2D coordinates.

return int(i), int(j)


def wallis_product(n_terms):
Expand All @@ -64,4 +74,11 @@ def wallis_product(n_terms):
"""
# XXX : The n_terms is an int that corresponds to the number of
# terms in the product. For example 10000.
return 0.
pi = 1
if n_terms == 0:
return pi

for n in range(1, n_terms+1):
pi *= (4*(n)**2)/(4*(n)**2 - 1)

return 2*pi
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