[未知用户]
如果“㎡”和“元”在每一行都出现,而且都在最后一个字符的话,可以通过取子串的办法删掉:
> a <- paste(1:1000000, "㎡", sep = "")
> system.time(stringr::str_replace(a, "㎡", ""))
user system elapsed
0.92 0.00 0.92
> system.time(gsub("㎡", "", a))
user system elapsed
1.42 0.00 1.42
> system.time(substr(a, 1, nchar(a) - 1))
user system elapsed
0.36 0.00 0.36