Extract a named parameter vector from a draws matrix at a given draw index. Errors if a requested variable cannot be found (neither as the cleaned name nor as "b_"), since a silent NA would corrupt downstream SBC ranks.

Extract a named parameter vector from a draws matrix at a given draw index. Errors if a requested variable cannot be found (neither as the cleaned name nor as "b_"), since a silent NA would corrupt downstream SBC ranks.

Usage

.extract_truth(draws_mat, draw_id, vars_of_interest)