Adds a ruler for the population size. This function works like the function legend,
NRuler(x, y = NULL, Nsize, Nlab = Nsize, N4, size.scale,
linear.scale = 0.2, log.base = 10, ...)Position of the population size ruler. If y does not have numeric value, x will support keyword input from the list "bottomright", "bottom", "bottomleft","left", "topleft", "top", "topright", "right" and "center".
The population sizes of the ticks on the ruler.
The labels on the ticks of the ruler. Default labels are the population index.
Scalar to scale population size.
A keyword to define the way population size is scaled and displayed. It supports "log" and "linear".
The scale factor applied to the population size when size.scale = "linear".
The base of logarithm used when size.scale = "log".
Additional arguments can be passed, such as col, lwd, lty.