IFunction_sptr IqtFit::createUserFunction(const QString &name, bool tie) {
IFunction_sptr result =
FunctionFactory::Instance().createFunction("UserFunction");
std::string formula;
if (name.startsWith("Exp")) {
formula = "Intensity*exp(-(x/Tau))";
} else {
formula = "Intensity*exp(-(x/Tau)^Beta)";
}
IFunction::Attribute att(formula);
result->setAttribute("Formula", att);
QList<QtProperty *> props = m_properties[name]->subProperties();
for (int i = 0; i < props.size(); i++) {
std::string name = props[i]->propertyName().toStdString();
result->setParameter(name, m_dblManager->value(props[i]));
// add tie if parameter is fixed
if (tie || !props[i]->subProperties().isEmpty()) {
std::string value = props[i]->valueText().toStdString();
result->tie(name, value);
}
}
result->applyTies();
return result;
}
/**
* @param fun :: The function
* @param expr :: The tie expression: parName = TieString
*/
void FunctionFactoryImpl::addTie(IFunction_sptr fun,
const Expression &expr) const {
if (expr.size() > 1) { // if size > 2 it is interpreted as setting a tie (last
// expr.term) to multiple parameters, e.g
// f1.alpha = f2.alpha = f3.alpha = f0.beta^2/2
const std::string value = expr[expr.size() - 1].str();
for (size_t i = expr.size() - 1; i != 0;) {
--i;
fun->tie(expr[i].name(), value);
}
}
}