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

You can pass functions to rename_at, so do

 means14 <- dat14 %>%
  group_by(class) %>%
  select(-ID) %>%
  summarise_all(funs(mean(.))) %>% 
  rename_at(vars(-class),function(x) paste0(x,"_2014"))