Nonsmooth density f^* with seven cusps introduced in the article of Savchuk (2017).
numerical vecror of argument values in the range [-3,3].
The function f^* consists of straight lines with different slopes connected together. The support of the density is [-3,3].
The vector of values of f^* corresponding to the values of the vector u.
Savchuk, O.Y. (2017). One-sided cross-validation for nonsmooth density functions, arXiv:1703.05157.
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