void _write_error_msg(std::ostream* error_msgs,
const std::domain_error& e) {
if (!error_msgs) return;
*error_msgs << std::endl
<< "Informational Message: The current Metropolis proposal is about to be "
<< "rejected becuase of the following issue:"
<< std::endl
<< e.what() << std::endl
<< "If this warning occurs sporadically, such as for highly constrained "
<< "variable types like covariance matrices, then the sampler is fine,"
<< std::endl
<< "but if this warning occurs often then your model may be either severely "
<< "ill-conditioned or misspecified."
<< std::endl;
}
void _write_error_msg(std::ostream* error_msgs,
const std::domain_error& e) {
if (!error_msgs) return;
*error_msgs << std::endl
<< "Informational Message: The parameter state is about to be Metropolis"
<< " rejected due to the following underlying, non-fatal (really)"
<< " issue (and please ignore that what comes next might say 'error'): "
<< e.what()
<< std::endl
<< "If the problem persists across multiple draws, you might have"
<< " a problem with an initial state or a gradient somewhere."
<< std::endl
<< " If the problem does not persist, the resulting samples will still"
<< " be drawn from the posterior."
<< std::endl;
}