plotParetoFront: Plot a GP Pareto Front
In rgp: R genetic programming framework

Plots fitness/complexity/age Pareto fronts for multi-objective GP. The z-coordinate represents individual age and is shown in form of a color scale, where younger individuals are bright green, individuals with age maxZ are black. Individuals not on the first Pareto front are shown as small gray circles, regardless of age.

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plotParetoFront(x, y, z, indicesToMark = integer(), maxZ = 50,
  main = sprintf("Population Pareto Front Plot (% Individuals)", length(x)),
  ...)

`x`	A vector of type `numeric` representing individual fitness.
`y`	A vector of type `numeric` representing individual complexity.
`z`	A vector of type `integer` representing individual age.
`indicesToMark`	A index vector of points to mark with red crosses.
`maxZ`	The individual age at the large end of the age color scale.
`main`	The plot's title.
`...`	Graphic parameters for `par` and further arguments to `plot`. For example, use the `main` parameter to set a title.