accumulate

Understanding std::accumulate

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You’re making a mistaken assumption: that type T is of the same type as the InputIterator. But std::accumulate is generic, and allows all different kinds of creative accumulations and reductions. Example #1: Accumulate salary across Employees Here’s a simple example: an Employee class, with many data fields. class Employee { /** All kinds of data: … Read more

How to find the cumulative sum of numbers in a list?

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If you’re doing much numerical work with arrays like this, I’d suggest numpy, which comes with a cumulative sum function cumsum: import numpy as np a = [4,6,12] np.cumsum(a) #array([4, 10, 22]) Numpy is often faster than pure python for this kind of thing, see in comparison to @Ashwini’s accumu: In [136]: timeit list(accumu(range(1000))) 10000 … Read more

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