[R] non-parametric regression with a convexity constraint

[thierrydb]

I would like to know if there's a package in R that enables to get a
non-parametric regression (OLS, not quantile) that would have a positive (or
negative) convexity constraint, as well as monotonicity. 

Right now, I have only found two packages (fdrtool and cir) that enable to
impose only monotonicity.

Thanks,

TDB

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