`add_prev_result()`, to gain a parameter `prev_result = "prev_result"`

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Transition/src/transition.cpp

Line 608 in 248269d

DataFrame add_prev_result(DataFrame object, const char* subject = "subject", const char* timepoint = "timepoint", const char* result = "result")

DataFrame add_prev_result(
	DataFrame object, const char* subject = "subject",
	const char* timepoint = "timepoint",
	const char* result = "result",
	const char* prev_result = "prev_result")
{
//	cout << "——Rcpp::export——add_prev_result(DataFrame, const char*, const char*, const char*) subject " << subject << "; timepoint " << timepoint << "; result " << result << endl;
	try {
		object.push_back(prevres_intvec(object, subject, timepoint, result), prev_result);
		return object;
	} catch (exception& e) {
		Rcerr << "Error in add_prev_result(): " << e.what() << '\n';
	} catch (std::invalid_argument& iva) {
		Rcerr << "Error invalid argument: " << iva.what() << '\n';
	}
	return DataFrame::create();
}

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