Question

目标是从height列创建一个新列，其中包含3个类：

高度<5低;
height＆gt; = 5＆amp; ＆lt; = 10是中等和
高度> 10是高。

我该怎么做？我试过了：

estudo[estudo$heigth<5,]$classheigth<-"baixo"

但它给出了错误。

"missing values are not allowed in sub scripted assignments of data frames"`

示例数据

# dput(head(estudo, 10))
estudo <- structure(list(height = c(2, 10, 20, 15, 3, 6.333333333, 7, 6, 3.4, 7)), 
   .Names = "height", row.names = c(NA, 10L), class = "data.frame")

Answer 1

希望这有帮助！

estudo$class <- cut(estudo$height, c(0, 5, 10, Inf), 
                    labels = c('low', 'medium', 'high'))

输出为：

      height  class
1   2.000000    low
2  10.000000 medium
3  20.000000   high
4  15.000000   high
5   3.000000    low
6   6.333333 medium
7   7.000000 medium
8   6.000000 medium
9   3.400000    low
10  7.000000 medium

示例数据：

estudo <- structure(list(height = c(2, 10, 20, 15, 3, 6.333333333, 7, 6, 3.4, 7)), 
                    .Names = "height", row.names = c(NA, 10L), class = "data.frame")

Answer 2

如果课程不是太多，你也可以这样做：

estudo$class[estudo$height < 5] <- "low"
estudo$class[estudo$height >= 5 & estudo$height <= 10] <- "medium"
estudo$class[estudo$height > 10] <- "high"

      height  class
1   2.000000    low
2  10.000000 medium
3  20.000000   high
4  15.000000   high
5   3.000000    low
6   6.333333 medium
7   7.000000 medium
8   6.000000 medium
9   3.400000    low
10  7.000000 medium

使用数字列创建包含类的列

2 个答案: