regfun: Beta regularization function
Description
This function computes regularization penalty term based on the betas and a difference.
Usage
regfun(beta, regularization_order = 2)
Arguments
beta
A spline parameter vector length num_params.
regularization_order
An integer (typically 0, 1, 2), indicating differencing order for L2
regularization of spline parameters. Default is 2 for second derivative penalty.
Value
A scalar regularization value.