This function sets the colors of cases of an iSet. Every iPlot is
free to use the corresponding representation individually. Color of a
case is a iSet-global property, that is all iPlots associated with an
iSet will reflect the change.
Usage
iset.col(col)
Arguments
col
Vector of integers specifying colors or a factor. The
values are re-cycled if necessary. 0 has a special meaning denoting
"no color", i.e. the plot is free to use the default color. This is
also the default state of a newly created iSet.