R 中 data.frame 列的最后一个字符

Question

I have a table inside a data.frame, and I need to get only the last two characters from that table, how do I do this?

Note: I was trying to do it using str_sub, but in it I can only define which character starts and which ends, and my data varies the size of characters. Follow my example below that does not solve:

base$estado <- str_sub(psd_base$itbc_name, start = 2)

Answer 1

You can use the functions substr() and nchar() to select the last letter of a character. Both are directly applicable to vectors, so you can write:

names = c("Alpha","Bip","Charlemagne","Haggs","O")
substr(names,nchar(names),nchar(names))

Which will give the output:

[1] "a" "p" "e" "s" "O"

Since I do not have a reproducible example of your data, this example has to suffice. I think you get the idea.