


Cumulative Sum in Python
Question:
How can we find the cumulative sum of numbers in a list, like [4, 4 6, 4 6 12]?
Introduction:
Calculating the cumulative sum involves repeatedly adding the next element to the running sum. While this can be achieved with a straightforward loop, there are more efficient approaches using NumPy or custom Python generators.
NumPy Method:
NumPy's cumsum function provides an efficient solution:
import numpy as np time_interval = [4, 6, 12] np.cumsum(time_interval) # Output: [4, 10, 22]
This approach is highly optimized and recommended for numerical operations on large arrays.
Python Generator:
For concise and memory-efficient solutions in pure Python, consider using a generator:
def accumu(iterable): yield next(iterable) for item in iterable: yield item + sum(accumu(iterable))
Using this generator:
list(accumu(time_interval)) # Output: [4, 10, 22]
This generator lazily accumulates elements, making it suitable for iterating over large sequences or when memory is a concern.
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