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Example changed to use list comprehension for scalar multiplication. #1

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Example changed to use list comprehension for scalar multiplication. #1

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11 changes: 10 additions & 1 deletion python_examples/numpy_21_ex1.py
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Original file line number Diff line number Diff line change
Expand Up @@ -27,7 +27,16 @@ def list_times(alist, scalar):
time1 = timeit.timeit('arr * 1.1', 'from __main__ import arr', number=N) / N
print time1

# More closely equivalent to what is being done in example above:
# return new array where all values are multiplied by scalar, leaving orignal unchanged
time2a = timeit.timeit('[a * 1.1 for a in larr]',
'from __main__ import larr', number=N) / N
print time2a

# List and custom function for broadcasting
time2 = timeit.timeit('list_times(larr, 1.1)',
'from __main__ import list_times, larr', number=N) / N
print time2
print time2


print time2a/time1, time2/time1, "times slower"