R arrange排序-优快云博客

本文链接：https://blog.youkuaiyun.com/beikewz/article/details/133022144

该篇博客展示了如何在R语言中使用dplyr包对iris数据集进行升序和降序排序，并通过head()和tail()函数查看数据集的首尾记录。同时，使用summary()函数给出了数据集的统计摘要，包括最小值、四分位数、中位数、平均值和最大值等关键信息。

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iris是R Studio自带的数据集datasets里包含的,可以直接使用或datasets::iris这样引用.
library(help = "datasets")可以看到详细的数据集列表.

> # 默认升序
> iris %>% arrange(Sepal.Length) %>% head()
  Sepal.Length Sepal.Width Petal.Length Petal.Width Species
1          4.3         3.0          1.1         0.1  setosa
2          4.4         2.9          1.4         0.2  setosa
3          4.4         3.0          1.3         0.2  setosa
4          4.4         3.2          1.3         0.2  setosa
5          4.5         2.3          1.3         0.3  setosa
6          4.6         3.1          1.5         0.2  setosa
> # desc降序
> iris %>% arrange(desc(Sepal.Length)) %>% head()
  Sepal.Length Sepal.Width Petal.Length Petal.Width   Species
1          7.9         3.8          6.4         2.0 virginica
2          7.7         3.8          6.7         2.2 virginica
3          7.7         2.6          6.9         2.3 virginica
4          7.7         2.8          6.7         2.0 virginica
5          7.7         3.0          6.1         2.3 virginica
6          7.6         3.0          6.6         2.1 virginica

> iris %>% head()
  Sepal.Length Sepal.Width Petal.Length Petal.Width Species
1          5.1         3.5          1.4         0.2  setosa
2          4.9         3.0          1.4         0.2  setosa
3          4.7         3.2          1.3         0.2  setosa
4          4.6         3.1          1.5         0.2  setosa
5          5.0         3.6          1.4         0.2  setosa
6          5.4         3.9          1.7         0.4  setosa

> iris %>% tail()
    Sepal.Length Sepal.Width Petal.Length Petal.Width   Species
145          6.7         3.3          5.7         2.5 virginica
146          6.7         3.0          5.2         2.3 virginica
147          6.3         2.5          5.0         1.9 virginica
148          6.5         3.0          5.2         2.0 virginica
149          6.2         3.4          5.4         2.3 virginica
150          5.9         3.0          5.1         1.8 virginica

> summary(iris)
  Sepal.Length    Sepal.Width     Petal.Length    Petal.Width          Species
 Min.   :4.300   Min.   :2.000   Min.   :1.000   Min.   :0.100   setosa    :50
 1st Qu.:5.100   1st Qu.:2.800   1st Qu.:1.600   1st Qu.:0.300   versicolor:50
 Median :5.800   Median :3.000   Median :4.350   Median :1.300   virginica :50
 Mean   :5.843   Mean   :3.057   Mean   :3.758   Mean   :1.199
 3rd Qu.:6.400   3rd Qu.:3.300   3rd Qu.:5.100   3rd Qu.:1.800
 Max.   :7.900   Max.   :4.400   Max.   :6.900   Max.   :2.500

参考:https://www.rdocumentation.org/packages/dplyr/versions/0.7.8/topics/arrange