  Periodic splines are a special kind of splines that are defined over a set of
knots over a circle and are adequate for solving interpolation problems related
to closed curves. This paper presents a method of implementing the objects
representing such splines and describes how an efficient orthogonal basis can
be obtained. The proposed orthonormalized basis is called a periodic splinet in
the reference to earlier work where analogous concepts and tools have been
introduced for splines on an interval. Based on this methodology, the periodic
splines and splinets are added to the earlier version of the R package
"Splinets". Moreover, the developed computational tools have been applied to
functionally analyze a standard example of functional circular data of wind
directions and speeds.
