title: How to apply a formatting edit to all data in a dataframe
body: <p>I'm very, very new to R, and I have some data from quiz scores that is stored as strings like &quot;2.00 / 2&quot; or &quot;0.00 / 2,&quot; and I'm trying to turn them into numeric types so that I can do operations on them. How does one apply a functions like gsub() and as.numeric() to all the data (except the first column, which has participants' names)?</p>