Expose a model's compiled functions — expose

brms compiles Stan functions and expose_functions() makes them callable from R. frmtmb compiles nothing: the model is an R closure built by build_objective() and differentiated by RTMB, and a custom family's density is the plain R function handed to custom_family(). The method is defined so that a ported brms script gets that reason rather than "could not find function".

Usage

expose_functions(x, ...)

# S3 method for class 'frmtmb_fit'
expose_functions(x, ...)

Arguments

x: A frmtmb_fit.
...: Ignored; this method always stops.

Value

This function never returns; it signals an error.

Examples

set.seed(1)
dd <- data.frame(x = rnorm(40))
dd$y <- rnorm(40, 1 + 0.5 * dd$x, 1)
fit <- frm(bf(y ~ x) + gaussian(), data = dd)
try(expose_functions(fit))
#> Error : expose_functions() has no Stan program to read on a frmtmb fit: a custom family's lpdf is the plain R function handed to custom_family(), callable as it is