title: Plotting a function with discrete x values in gnuplot
body: <p>I need to plot a function <code>f(x)</code>, where <code>x</code> is discrete set of values (in my case positive integers). I couldn't find a way to specify a step-size when using the range option and samples doesn't seem to be the right solution. Finally, I would like to approximate <code>f(x)</code> with a smooth function.</p>