- Any plot axis can be assigned a pair of functions, possibly nonlinear, that
 describe the forward and reverse mapping to a linear range (see set nonlinear (p. 
))
http://gnuplot.info/demo_5.4/nonlinear3.htmlNonlinear x/y axis demo
 
- The familiar command set logscale has been reimplemented as a special case
 nonlinear axis where the paired functions are log(x) and exp(x).