plotFunctions: Show an overlayed plot of multiple functions
In rgp: R genetic programming framework

Creates and shows and overlayed plot of one or more functions of one variable y = f(x).

plotFunctions(funcs, from = 0, to = 1, steps = 1024, type = "l",
  lty = 1:5, lwd = 1, lend = par("lend"), pch = NULL, col = 1:6,
  cex = NULL, bg = NA, xlab = "x", ylab = "y",
  legendpos = "bottomright", bty = "n", ...)

`funcs`	A list of functions of one variable to plot.
`from`	The left bound of the plot, i.e. the minimum x value to plot.
`to`	The right bound of the plot, i.e. the maximum x value to plot.
`steps`	The number of steps, or samples, to plot.
`type`	The plot type (e.g. l = line) as passed on to `matplot`.
`lty`	The line types as passed on to `matplot`.
`lwd`	The line widths as passed on to `matplot`.
`lend`	The line end cap types as passed on to `matplot`.
`pch`	The plot chars as passed on to `matplot`.
`col`	The plot colors as passed on to `matplot`.
`cex`	The character expansion sizes as passed on to `matplot`.
`bg`	The background (fill) colors as passed on to `matplot`.
`xlab`	The x axis label as passed on to `matplot`.
`ylab`	The y axis label as passed on to `matplot`.
`legendpos`	The position of the legend, passed as the `x` parameter to `legend`.
`bty`	The box type parameter of the legend, passed as the `bty` parameter to `legend`.
`...`	Graphic parameters for `par` and further arguments to `plot`. For example, use the `main` parameter to set a title.

plotFunctions(list(function(x) sin(x),
                   function(x) cos(x),
                   function(x) 0.5*sin(2*x)+1),
              -pi, pi, 256)