Adding prefix or suffix to most data.frame variable names in piped R workflow

Question

I want to add a suffix or prefix to most variable names in a data.frame, typically after they\'ve all been transformed in some way and before performing a join. I don\'t ha

Answer 1

This is a bit quicker, but not totally what you want:

dat14 %>%
  group_by(class) %>%
  select(-ID) %>%
  summarise_each(funs(mean(.))) -> means14 

names(means14)[-1] %<>% paste0("_mean_2014")

if you haven't used the %<>%-operator before definitely check this link out, its a super-useful tool.

you can also use it for recomputing or rounding some columns, like this df$meancolumn %<>% round() , and so on, it just comes up very often and just saves you a lot of writing