嵌套if语句-R [英] Nested if statements - R

问题描述

我在使用多个if语句时遇到问题.即使条件不正确，也总是从第一个条件获取输出.有人可以指出我做错了什么吗?

I am having a problem with multiple if statements. The output is always taken from the first condition, even if the condition is not correct.. Can anybody point out what am I doing wrong?

代码:

for(i in 1:length(data_model3$Gewicht)){
    if (data_model3$Gewicht[i] < 1){
      data_model3$LIXshipping <- 3.26 
    }
    else if (data_model3$Gewicht[i] > 1 & data_model3$Gewicht[i] < 2){
      data_model3$LIXshipping <- 3.26 
    }
    else if (data_model3$Gewicht[i] > 2 & data_model3$Gewicht[i] < 3){
      data_model3$LIXshipping <- 3.86 
    }
    else if (data_model3$Gewicht[i] > 3 & data_model3$Gewicht[i] < 4){
      data_model3$LIXshipping <- 3.86 
    }
    else if (data_model3$Gewicht[i] > 4 & data_model3$Gewicht[i] < 5){
      data_model3$LIXshipping <- 3.86 
    }
    else if (data_model3$Gewicht[i] > 5 & data_model3$Gewicht[i] < 10){
      data_model3$LIXshipping <- 4.39 
    }
    else if (data_model3$Gewicht[i] > 10 & data_model3$Gewicht[i] < 20){
      data_model3$LIXshipping <- 4.81 
    }
    else if (data_model3$Gewicht[i] > 20 & data_model3$Gewicht[i] < 31.5){
      data_model3$LIXshipping <- 6.34 
    }
    else 
      data_model3$LIXshipping <- 17.09 
}

输出:

count_code  Gewicht LIXshipping
281         4.67    3.26
683         3.34    3.26
903         14.56   3.26
7390        14.62   3.26
2778        2.86    3.26
2778        10.37   3.26

对于某些人来说，这可能是一个完全基本的问题，但我不知道如何解决.

It might be a completely basic question for some of you, but I have no idea how to fix it.

推荐答案

这可以通过一行(对于数据+一行)来完成:

This can be done by one line (+ one line for the data):

data_model3 <- data.frame(Gewicht=1:40)
data_model3$LIXshipping <- as.numeric(as.character(cut(data_model3$Gewicht, breaks=c(0,2,5,10,20,31.5, 100), labels=c(3.26, 3.86, 4.39, 4.81, 6.34, 17.09), right=FALSE)))

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