Gnuplot

• How to Set a Local `\graphicspath` for Gnuplot epslatex Plots
  Scope \graphicspath around the gnuplot-generated TeX file so LaTeX finds its companion graphic without changing paths elsewhere.
• How to Define a Function Once in PGFPlots
  Declare a PGF math function once, then use it for numerical calculations and ordinary PGFPlots curves without duplicating its formula.