Extract Draws from CmdStanMCMC Objects — extract_chkpt

A convenience function for extracting the draws from a CmdStanMCMC object.

extract_chkpt_draws(object, phase)

Arguments

object: An object of class CmdStanMCMC.
phase: Character string. Which phase during checkpointing? The options included warmup and sample. The latter extracts the draws with inc_warmup = FALSE, which is the default in draws

Value

A 3-D draws_array object (iteration x chain x variable).

Note

This can be used to extract the draws in general by setting phase = "sample" which then only includes the post-warmup draws.

Examples

if (FALSE) {
 library(cmdstanr)

# eight schools example
fit_schools_ncp_mcmc <- cmdstanr_example("schools_ncp")

drws <- extract_chkpt_draws(object = fit_schools_ncp_mcmc,
                            phase = "sample")

# compare to cmdstanr
all.equal(drws, fit_schools_ncp_mcmc$draws())
}