数字排序R中的字符串列表

Question

我有一个清单:

a <- ["12file.txt", "8file.txt", "66file.txt"]

我想按数字排序:

a would be: ["8file.txt", "12file.txt", "66file.txt"]

现在我只能得到这个:

a = ["12file.txt", "66file.txt", "8file.txt"]

谢谢

Answer 1

我假设你有一个字符向量:

a <- c("12file.txt", "8file.txt", "66file.txt")

我会通过拉出每个字符串开头的数字并对其进行排序来解决这个问题:

num <- as.numeric(sub("([0-9]+).*", "\\1", a))
a[order(num)]
#[1] "8file.txt"  "12file.txt" "66file.txt"