Given a scatterplot of (x_i, y_i), i = 1,…,n, where old{x} is the predictor and old{y} is the response which could be Gaussian, Poisson and binomial. The underlying mean curve in this scatterplot is denoted as old{f_m(x)}, where old{f_m(x)} is a smooth curve with a change-point m which falls in one of the three categories:
changept
(Package: ShapeChange) :
Change-Point Estimation using Shape-Restricted Splines
'changept' is used to estimate the location of the change-point in the underlying mean curve of a scatterplot and the curve as well using shape-restricted B-splines. The change-point falls in one of the three categories: a mode, an inflection point and a jump point.
providing 
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