title: Convert any column in a data frame with numbers to a numeric value (is.numeric)
body: <p>I have a large data frame and it's a mixture of character, integer, and numeric columns. From what I've seen, some columns that I want to be numeric are not always numeric. I can manually convert each one but I wanted to see if there was a way to detect a column with numbers in it and then convert it to numeric. </p>