For plots with an "inner plot range" (see Details) this function converts the data values to the coordinates in the plot
1 
x 
data to be represented 
range 
vector of 2 elements giving the inner plot range. Data
beyond the given interval will be nonlinearly transformed to fit
within the (outer) plot margins. Defaults to

limfac 
factor used to determine the default of 
limext 
factor for extending the 
When plotting data that contain outliers, the nonoutlying data is represented poorly. Rather than simply clipping outliers, one can split the plotting area into an inner region, where the (nonoutlying) data is plotted as usual, and a plot area margin, in which outliers are represented on a highly nonlinear scale that allows to display them all.
This function converts the data to the coordinates used in the graphical display, and also returns the inner range for plotting.
vector of coordinates used for plotting, that is, unchanged x
values for those within the range
and transformed values
for those outside.
Attributes:
attr(,"range") 
the "inner" plot range, either the argument

attr(,"nmod") 
the number of modified observations 
Werner Stahel
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