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

After additional experimenting since posting this question, I've found that the setNames function will work with the piping as it returns a data.frame:

dat14 %>%
  group_by(class) %>%
  select(-ID) %>%
  summarise_each(funs(mean(.))) %>%
  setNames(c(names(.)[1], paste0(names(.)[-1],"_mean_2014"))) 

  class speed_mean_2014 power_mean_2014 force_mean_2014
1     a       0.5572500             0.8       0.5519802
2     b       0.2850798             0.6       1.0888116