用C或Python移动3个元素的平均值 [英] moving average of 3 elements by C or Python

问题描述

我想计算3个元素的移动平均值.

I want to calculate the moving average of 3 elements.

例如，我有25个销售数据元素.我需要通过对这25个数据元素取平均值来计算移动平均值.

For example, I have a 25 elements of sales data. I need to calculate the moving average taken from averaging these 25 elements of data.

当将实际数组作为数据给出时，我想编写一个程序，该程序将确定3个元素的移动平均值并创建一个数组.数组中的元素数比给定序列短2个元素. 例如，如果给我:

When a real array is given as data, I want to write a program that will determines a 3 element moving average and creates an array. The number of elements in the array becomes 2 elements shorter than the given sequence. For example, if I am given:

[7.0, 9.0, 5.0, 1.0, 3.0]

我想得到:

[7.0, 5.0, 3.0]

推荐答案

您可以使用Python

You could use a Python deque for doing this as follows:

from collections import deque

prices = [7.0, 9.0, 5.0, 1.0, 3.0]
moving_average = deque()
total = 0.0
days = 3
averages = []

for price in prices:
    moving_average.append(price)
    total += price

    if len(moving_average) > days:      # Length of moving average
        total -= moving_average.popleft()

    averages.append(total / float(len(moving_average)))

print averages

这将显示以下输出:

[7.0, 8.0, 7.0, 5.0, 3.0]

或者您可以如下跳过初始输入:

Or you could skip the initial entries as follows:

print averages[days-1:]

给予:

[7.0, 5.0, 3.0]

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