如何在R中使用聚合函数 [英] How to use Aggregate function in R

问题描述

请问我如何在R中正确使用聚合函数？
我有这样的数据：

can you help me please how to properly use aggregate function in R? I have data like this:

SPORT   FLOWS
[1,] "Other" "1"  
[2,] "Other" "1"  
[3,] "Other" "1"  
[4,] "Other" "1"  
[5,] "Other2" "1"  
[6,] "Other2" "1"

我需要得到这个：

SPORT   FLOWS
[1,] "Other" "4"
[2,] "Other2" "2"

我发现，可以使用聚合函数来完成，但是它不起作用。

I found, that it can be done with aggregate function, but it doesn't work..

谢谢大家。.我已标记出对我有用的答案。

Thank you guys.. I have marked answer which worked for me..

推荐答案

aggregate(FLOWS ~ SPORT, dat, function(x) sum(as.numeric(x)))

其中 dat 是矩阵的名称。

在这里，必须使用函数 is.numeric 才能将第二列转换为数字。

Here, the function is.numeric is necessary to transform the second column into numbers.

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