title: Is there a command line tool for data visualization and analysis?
body: <p>I'm searching for a command line tool (for linux) to generate plots out of a data file. I tried to play with gnuplot at first but it's curve fitting capabilities aren't that good. </p>
  
  <p>Then I tried R but I couldn't find a way to write a vector (little arrow over the sign) or a thermal average (\left \langle \right \rangle in LaTeX). </p>
  
  <p>I there some hidden plugin for any of those I couldn't find to complete the task?</p>