# File rongo.rb, line 121
  def col(name, colloc)
    colloc -= 1
    loc = @@validcolnames.index(name)
    if loc == nil
      senderror("Col name #{name} not valid for col")
    else
      infile = open(@@datafilename, "r")
      @@coldata[loc].clear
      while s = infile.gets
        val = s.split[colloc]
        @@coldata[loc].push(val.to_f) if val
      end
    end
  end