R：如何在每行中生成最高值的向量？ [英] R: How to generate vectors of highest value in each row?

问题描述

假设我的数据框包含

 > DF 
 V1 V2 V3 
 1 0.3 0.4 0.7 
 2 0.4 0.2 0.1 
 3 0.2 0.8 0.3 
 4 0.5 0.8 0.9 
 5 0.2 0.7 0.8 
 6 0.8 0.3 0.6 
 7 0.1 0.5 0.4 
  

行将是不同的类型的汽车，
，列将是给定类别的V1，V2，V3的概率。

我想生成一个矢量，分配给每个汽车它的概率最高的类别
例如，我想要汽车1与V3相关联，汽车2与V1相关联，汽车3与V2关联。

任何帮助或提示如何解决这个问题？

解决方案

我们可以使用 max.col 获取与每行最大值相对应的列索引。

 名称（DF）[max.col（DF，first）] 
＃[1]V3V1V2V3V3V1 
  

Let's say that my data frame contains

> DF
   V1   V2   V3  
1  0.3  0.4  0.7  
2  0.4  0.2  0.1  
3  0.2  0.8  0.3  
4  0.5  0.8  0.9   
5  0.2  0.7  0.8  
6  0.8  0.3  0.6  
7  0.1  0.5  0.4  

the rows would be the different types of automobiles, and the columns would be the probabilities for a given category of V1, V2, V3.

I want to generate a vector that assigns to each automobile the category of which it has the highest probability in. For example, I'd want automobile 1 to be associated with V3, automobile 2 to be associated with V1, automobile 3 to be associated with V2.

Any aids or hints on how I should tackle this?

解决方案

We can use max.col to get the column index that corresponds to the largest value in each row.

names(DF)[max.col(DF, "first")]
#[1] "V3" "V1" "V2" "V3" "V3" "V1" "V2"

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