R编程计算行平均值 [英] R Programming Calculate Rows Average

问题描述

如何使用R计算行均值?

How to use R to calculate row mean ?

样本数据:

f<- data.frame(
  name=c("apple","orange","banana"),
  day1sales=c(2,5,4),
  day1sales=c(2,8,6),
  day1sales=c(2,15,24),
  day1sales=c(22,51,13),
  day1sales=c(5,8,7)
)

预期结果:

随后，该表将添加更多列，例如，预期结果仅直到AverageSales day1sales.4为止.运行更多数据后，它将添加到day1sales.6上，依此类推.那么如何计算所有行的平均值?

Subsequently the table will add more column for example the expected results is only until AverageSales day1sales.4. After running more data, it will add on to day1sales.6 and so on. So how can I count the average for all the rows?

推荐答案

和rowMeans

> rowMeans(f[-1])
## [1]  6.6 17.4 10.8

您还可以在数据集的均值中添加另一列

You can also add another column to of means to the data set

> f$AvgSales <- rowMeans(f[-1])
> f
##     name day1sales day1sales.1 day1sales.2 day1sales.3 day1sales.4 AvgSales
## 1  apple         2           2           2          22           5      6.6
## 2 orange         5           8          15          51           8     17.4
## 3 banana         4           6          24          13           7     10.8

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