r-cran-splines2

GNU R regression spline functions and classes
  https://cran.r-project.org/package=splines2
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Constructs B-splines and its integral, monotone splines (M-splines) and its integral (I-splines), convex splines (C-splines), and their derivatives of given order. Piecewise constant basis is allowed for B-splines and M-splines. See De Boor (1978) , Ramsay (1988) , and Meyer (2008) for more information.