Advanced topics

David L Miller & Jason J Roberts

This is a whirlwind tour...

...and some of this is experimental

Smoother zoo

Cyclic smooths

  • What if things “wrap around”? (Time, angles, …)
  • Match value and derivative
  • Use bs="cc"
  • See ?smooth.construct.cs.smooth.spec

A cyclic spline

Duchon splines

  • Thin plate splines do weird things far from data
  • Local bits are fine, but unpenalised planes are bad
  • Remove the badly behaved bits?
  • (Miller and Kelly, in prep)
  • ?smooth.construct.ds.smooth.spec