Specify Matrix of Rates

Not implemented

mat_rate()

See also

Other flexmodel_definition_functions: add_factr(), add_linearized_outflow(), add_parallel_accumulators(), add_rate(), add_state_mappings(), add_state_param_sum(), initial_population(), rep_rate(), update_disease_free_state(), update_linearized_params(), update_tmb_indices(), vec_rate()

Other rate_functions: add_rate(), rep_rate(), vec_rate()