目录
需求
R默认带文本的编号不是按数字来排序的，这会对数据排序造成一定影响。如paste0("sample",1:10)在列中排序不是按1-100，而是按ASCII排序。
> sort(paste0("sample",1:10))
[1] "sample1" "sample10" "sample2" "sample3" "sample4" "sample5" "sample6" "sample7" "sample8" "sample9"
要想按数字排序，需要首先编制如01,02,03......等序号，再与文本进行合并。
formatC函数解决
> num <- formatC(1:10, flag = '0', width = 2)
> num
[1] "01" "02" "03" "04" "05" "06" "07" "08" "09" "10"
> sort(paste0("sample",num))
[1] "sample01" "sample02" "sample03" "sample04" "sample05" "sample06" "sample07" "sample08" "sample09" "sample10"
标签：sample,10,003,002,001,num,序号,排序,paste0 From： https://www.cnblogs.com/jessepeng/p/16800731.html