R/fit.R
fit-method-grad_log_prob.Rd
The $grad_log_prob()
method provides access to the
Stan model's log_prob
function and its derivative
grad_log_prob(unconstrained_variables, jacobian_adjustment = TRUE)
(numeric) A vector of unconstrained parameters
to be passed to grad_log_prob
.
(bool) Whether to include the log-density adjustments from un/constraining variables.
log_prob()
, grad_log_prob()
, constrain_variables()
,
unconstrain_variables()
, unconstrain_draws()
, variable_skeleton()
,
hessian()
# \dontrun{
fit_mcmc <- cmdstanr_example("logistic", method = "sample")
fit_mcmc$init_model_methods()
#> Error: Model methods cannot be used with a pre-compiled Stan executable, the model must be compiled again
fit_mcmc$grad_log_prob(unconstrained_variables = c(0.5, 1.2, 1.1, 2.2))
#> Error: The method has not been compiled, please call `init_model_methods()` first
# }