MCMC chain draws from a fit

Returns a fit's posterior draws only when they form a genuine MCMC chain ($draws_kind == "chain", or an untagged legacy fit); for an i.i.d. / approximation fit (nested Laplace, VI, SMC, ...) it returns NULL, because chain diagnostics do not apply. This is the accessor diagnostics() gates on. For the provenance-agnostic posterior sample used by summaries, see posterior_sample().

Usage

mcmc_draws(fit)

Arguments

fit

A tulpa_fit (or subclass) carrying posterior $draws.

Value

The chain draws matrix/array, or NULL for a non-chain fit.

See also

posterior_sample(), diagnostics()