This function adds one straight line through the current iPlot.
iabline(a = NULL, b = NULL, reg = NULL, coef = NULL, ..., plot = iplot.cur())
the intercept and slope
a vector of length two giving the intercept and slope
an object with a coef
component
object options for iobj.opt
plot to which this line is to be added
Resulting iObject.
Typical usages are
iabline(a, b, ...) iabline(coef=, ...) iabline(reg=, ...)