mirror of
https://github.com/TheAlgorithms/Python.git
synced 2024-12-18 09:10:16 +00:00
0435128cc0
* geometric_mean3
* update-GM.PY
* update-AM.PY
* Revert "update-AM.PY"
This reverts commit 11792ec974.
76 lines
2.0 KiB
Python
76 lines
2.0 KiB
Python
"""
|
|
GEOMETRIC MEAN : https://en.wikipedia.org/wiki/Geometric_mean
|
|
"""
|
|
|
|
|
|
def is_geometric_series(series: list) -> bool:
|
|
"""
|
|
checking whether the input series is geometric series or not
|
|
|
|
>>> is_geometric_series([2, 4, 8])
|
|
True
|
|
>>> is_geometric_series([3, 6, 12, 24])
|
|
True
|
|
>>> is_geometric_series([1, 2, 3])
|
|
False
|
|
>>> is_geometric_series([0, 0, 3])
|
|
False
|
|
|
|
"""
|
|
if len(series) == 1:
|
|
return True
|
|
try:
|
|
common_ratio = series[1] / series[0]
|
|
for index in range(len(series) - 1):
|
|
if series[index + 1] / series[index] != common_ratio:
|
|
return False
|
|
except ZeroDivisionError:
|
|
return False
|
|
return True
|
|
|
|
|
|
def geometric_mean(series: list) -> float:
|
|
"""
|
|
return the geometric mean of series
|
|
|
|
>>> geometric_mean([2, 4, 8])
|
|
3.9999999999999996
|
|
>>> geometric_mean([3, 6, 12, 24])
|
|
8.48528137423857
|
|
>>> geometric_mean([4, 8, 16])
|
|
7.999999999999999
|
|
>>> geometric_mean(4)
|
|
Traceback (most recent call last):
|
|
...
|
|
ValueError: Input series is not valid, valid series - [2, 4, 8]
|
|
>>> geometric_mean([1, 2, 3])
|
|
Traceback (most recent call last):
|
|
...
|
|
ValueError: Input list is not a geometric series
|
|
>>> geometric_mean([0, 2, 3])
|
|
Traceback (most recent call last):
|
|
...
|
|
ValueError: Input list is not a geometric series
|
|
>>> geometric_mean([])
|
|
Traceback (most recent call last):
|
|
...
|
|
ValueError: Input list must be a non empty list
|
|
|
|
"""
|
|
if not isinstance(series, list):
|
|
raise ValueError("Input series is not valid, valid series - [2, 4, 8]")
|
|
if len(series) == 0:
|
|
raise ValueError("Input list must be a non empty list")
|
|
if not is_geometric_series(series):
|
|
raise ValueError("Input list is not a geometric series")
|
|
answer = 1
|
|
for value in series:
|
|
answer *= value
|
|
return pow(answer, 1 / len(series))
|
|
|
|
|
|
if __name__ == "__main__":
|
|
import doctest
|
|
|
|
doctest.testmod()
|