Register a custom C++ trend kernel — register

Compiles and registers a user-provided C++ function that maps per-trial kernel parameters and inputs to a numeric vector. The C++ function must have signature: NumericVector f(NumericMatrix trend_pars, NumericMatrix input) and provide an exported pointer creator using EMC2_MAKE_PTR.

Usage

register_trend(trend_parameters, file, transforms = NULL, base = "add")

Arguments

trend_parameters: Character vector of kernel parameter names (in order).
file: Path to the C++ file implementing the custom kernel. The file should include EMC2/userfun.hpp and define a pointer creator (via EMC2_MAKE_PTR) that is exported to R.
transforms: Optional named character vector or list mapping each custom kernel parameter name to a transform name (e.g., "identity", "exp", "pnorm"). Length must match trend_parameters. If unnamed but the correct length, the order is assumed to match trend_parameters.
base: Default base to use when creating trends with this custom kernel if no bases argument is supplied to make_trend. One of c("lin","exp_lin","centered","add","identity"). Default "add".

Value

An object to pass to make_trend(custom_trend=...), carrying the pointer, parameter names, default base, and optional transform mapping.