title: When using Gnuplot, how can the equation of a line be printed in the line title?
body: <p>I have used Gnuplot to plot my data, along with a linear regression line. Currently, the 'title' of this line, which has its equation calculated by Gnuplot, is just "f(x)". However, I would like the title to be the equation of the regression line, e.g. "y=mx+c". </p>
  
  <p>I can do this manually by reading off 'm' and 'c' from the plotting info output, then re-plot with the new title. I would like this process to be automated, and was wondering if this can be done, and how to go about doing it. </p>