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# splines2 0.4.1
## New features
* Added function `naturalSpline()` providing implementation of nonnegative
natural cubic splines.
* Added argument `periodic` to function `mSpline()` for periodic M-splines.
* Added argument `integral` to function `mSpline()` for integrals of M-splines
or periodic M-splines.
* Added `deriv`, `predict`, and `print` method for `naturalSpline` class object.
## Minor changes
* Updated the `deriv()` method for `mSpline` class object for periodic
M-splines.
# splines2 0.3.1
## Minor changes
* Modified testing examples for CRAN tests on r-patched-solaris-x86 and
r-oldrel-macos-x86_64.
# splines2 0.3.0
## New features
* Added function `BersteinPoly()` providing implementation of generalized
Bernstein polynomials.
* Added C++ interface that can be easily integrated with **Rcpp**.
## Major changes
* Changed most implementations from R to C++ with help of **Rcpp** and
**RcppArmadillo** to boost the performance.
## Minor changes
* Made piece-wise constant bases continuous at right boundary knot for
consistency with spline bases of non-zero degrees.
* Changed the default value of argument `intercept` in function `iSpline()` and
`cSpline()` to `TRUE` for a complete set of spline bases in shape-restricted
regression.
* Removed the corresponding M-spline basis from attributes of outputs from
`iSpline()` and `cSpline()`.
* Removed the corresponding B-spline basis from attributes of outputs from
`bSpline()`.
## Bug fixes
* Fixed `deriv.mSpline()` method for third derivatives of scaled C-splines.
# splines2 0.2.8
## Bug fixes
* Fixed inconsistency of argument `df` for piecewise constant bases when `knots
= NULL`.
## Minor changes
* Rewrote testing suite for using the **tinytest** package instead of
**testthat**.
# splines2 0.2.7
## Minor changes
* Updated tests for R development version.
# splines2 0.2.6
## Minor changes
* Added checks for any internal knot incorrectly placed outside of the boundary
knots and added warnings for users' reference.
# splines2 0.2.5
## Minor changes
* Added more tests and increased code coverage.
## Bug fixes
* Fixed evaluation of derivatives of M-splines for a single value. Thanks Ina
Jazic for reporting the bug and providing possible fix.
* Fixed `deriv.cSpline()` method for derivatives of order greater than two when
`scale = TRUE`.
# splines2 0.2.4
## New features
* Added function `dbs()` generating derivative of given order of B-splines. It
is a similar function with `splines::splineDesign()`. However, it provides a
more user-friendly interface and more consistent handling on `NA`'s.
* Added `deriv()` methods for derivatives of given order of any existing
**splines2** object that can be generated currently.
## Major changes
* Added argument `derivs` to function `mSpline()` and `iSpline()` for
derivatives.
* Changed all the classes of object generated for a better dispatching on
methods.
## Minor changes
* Added tests for all major functions with the help of package **testthat**.
## Bug fixes
* Fixed the generation of splines without any internal knot.
# splines2 0.2.3
## Bug fixes
* Fixed one-piece constant basis for M-splines.
# splines2 0.2.2
## Bug fixes
* Fixed the NA's handling in all the functions constructing spline bases.
# splines2 0.2.1
## New features
* Added function `bSpline()` generating B-spline basis allowing zero degree or
piecewise constant basis based on function `bs()` in the **splines** package.
* Introduced function `bSpline()` to allow M-splines of degree zero.
* Added function `cSpline()` constructing convex spline (C-spline) basis.
* Added `predict()` methods for `bSpline2` object and `cSpline` object generated
by `bSpline()` and `cSpline()`, respectively.
* Added `print()` methods for all **splines2** objects developed so far.
## Major changes
* Improved the function `iSpline()` to construct I-spline basis directly from
B-spline basis instead of M-spline basis.
## Minor changes
* Updated all CRAN URL to a canonical form suggested.
# splines2 0.1.0
## New features
* The first version of **splines2** providing functions constructing M-spline,
I-spline, and integral of B-spline basis.
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