在R中对月份进行排序

Question

我想对月份名称进行排序.当我使用该strptime函数时,它返回一个错误,因为属性值只包含月份名称.当我使用该sort函数时,月份按字母顺序排序.

Answer 1

您始终可以将数据转换为系数.例如,假设我们有

x = c("January", "February", "March", "January")  

然后转换为一个因素,我们有:

x_fac = factor(x, levels = month.name)

哪个在排序上给出:

R> sort(x_fac)
[1] January  January  February March   
12 Levels: January February March April May June July August ... December