how to use mutate_at and fct_rev() together?

One reason for getting error is xyz is undefined. You meant to use xyzq, I think.

From your description, it's not clear to me what is your expected output.

Can you please provide a REPRoducible EXample of your problem, mentioning a expected output for a small input?

I failed to find any factor in your example. If you just want to reverse a vector, you may use the rev function.

1 Like