title: Reading csv file and converting it into numeric
body: <p>While using R, I read a csv file and used colClasses="character", it convereted all the columns to character but I want the numeric columns(which contain commas) to remain numeric and be stored as they are in the same vector, how do I do that?
  I tried out as.numeric(gsub(", ","",stocks$Open)) but the problem with this is that it is not reflected back in the vector permanently.</p>