GNU R tools for working with points and intervals

 This GNU R package provides tools for working with and comparing sets of
 points and intervals.
 .
 The intervals package defines two S4 classes which represent collections
 of intervals over either the integers (Z) or the real number line (R). An
 instance of either class consists of a two-column matrix of endpoints, plus
 additional slots describing endpoint closure and whether the intervals are
 to be thought of as being over Z or R.