如何计算累计金额? [英] How to calculate cumulative sum?

问题描述

我有包含 biweek 和 Total 列的数据，我想获取 biweek 的累积总和.我的数据就像:

I have data containing columns biweek and Total, I want to get cumulative sum on biweek basis. My data is like:

biweek  Total
0   3060.913
1   4394.163
2   3413.748
3   2917.548
4   3442.055
5   3348.398
6   1771.722

我想得到像这样的输出:

and I want to get output like :

biweek  Total
0   3060.913
1   7455.076
2   10868.824
3   13786.372
4   17228.427
5   20576.825
6   22348.547

那么有可能实现它吗?

推荐答案

# replace the second column for the cumsum of the initial second column
data[, 2] <- cumsum(data[, 2])

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