splines2 0.5.4

Minor changes

• Suppressed the warning message for data outside boundary from the plot() methods.

Bug fixes

• Fixed the implementation of natural cubic splines with one internal knot: issue 18.

splines2 0.5.3

Minor changes

• Incorporated changes suggested by GCC compiler for C++20 to suppress the warning: warning: template-id not allowed for constructor in C++20.

splines2 0.5.2

New features

• Added a new argument named coef to the plot() method for splines2 objects, allowing visualization of the fitted spline function with a given coefficient vector.

Minor changes

• Made the error message more clear for duplicated internal knots.

splines2 0.5.1

Minor changes

• Fixed broken @docType package documentation.

splines2 0.5.0

New features

• Added a new function named nsk() for natural cubic spline basis functions following the function survival::nsk() (of survival package version 3.2-8).
• Added plot() methods to quickly visualize the spline basis functions.
• Added $ method to extract an attribute of the returned splines2 object.
• Added a new argument named periodic to bSpline() for periodic B-splines and a new class named PeriodicBSpline to the Rcpp interface: issue 19.
• Added a new argument named coef to the predict() methods to compute the responding spline function and made it possible to obtain the derivatives or update spline basis functions by passing ... to the update() methods.
• Added a new argument named trim to naturalSpline() to set the default boundary knots after trimming a fraction of observations.
• Added a new argument named warn.outside and a package option named splines2.warn.outside to specify if a warning should be thrown out for B-splines, etc. when any x is placed outside the boundary.
• Added the following function aliases to encourage the use in a model formula:
  • bsp() = bSpline()
  • msp() = mSpline()
  • isp() = iSpline()
  • csp() = cSpline()
  • nsp() = naturalSpline()
  • bpoly() = bernsteinPoly()
• Added a matrix named H to the attribution of objects for natural cubic splines so that users may transform cubic B-splines (from other software/packages) to the natural cubic splines (returned by naturalSpline()/nsp() or nsk()).

Major changes

• Adjusted the class order of the returned objects.
• Adjusted the default placement of the internal knots from the specified df to be equidistant if the internal knots resulted from quantiles are problematic. A warning will be thrown out in that case.

splines2 0.4.8

Bug fixes

• Fixed the Rcpp interface of PeriodicMSpline so that a simple knot sequence can be specified through set_knot_sequence: issue 18.

splines2 0.4.7

Minor changes

• Adjusted the column arrangement of the natural cubic spline basis matrix so that it matches the equations given in the JDS paper:
  issue 17.

splines2 0.4.6

New features

• Added update() methods to produce new spline basis functions based on the
  given object with specified updates in terms of degree and knots, etc.

Minor changes

• Appended a new class named splines2 to the output matrices to simplify some
  common S3 methods.

splines2 0.4.5

Minor changes

• Improved the computational efficiency of finding the knot intervals for x
  (by replacing the naive binary search implementation with std::upper_bound
  and std::distance).

splines2 0.4.4

New features

• Added the makepredictcall() methods for all available spline basis functions
  to help model.frame.default() create the right matrices when predicting from
  models with terms such as bSpline(), etc. Thanks Zheyuan Li for suggesting
  this feature.
• Added arguments derivs and integal to bSpline() for consistency with
  mSpline() and bernsteinPoly(), etc.

Minor changes

• Made the internal checking procedure more strict to throw an error if any
  internal knots are placed at or outside boundary:
  issue 5.

Bug fixes

• Fixed the predict() method for cSpline objects when scale = FALSE.