Qcustomplot converter data in "setData"

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Hello everyone,

I made a program that collects data from an Arduino
in x,y format in a listwidget. These x, y values ??must then be sent to the Qcustomplot and that's where there is a problem.

There is a comma between x and y. They arrive like that from the Arduino to be used in the Excel graph.

My problem is when collecting the data in the ui->customplot->graph(0)->setData(x,y) function;

I can't convert the data from the "QString(data)" to convert them

Here is the blocking part: (after ui->listwidget..)

void NetworkPlot::readData()
{
    qDebug() <<"Serialport works"; // it's ok (control port com)
    auto data = arduino->readAll(); // it's ok 
    ui->listWidget->addItem(QString(data)); // it's ok
 
    QString str = QString(data); // start of problem
    QStringList parts = str.split(" ");
    if (parts.size() == 2) {
        qDebug() << parts.at(1).toDouble() << parts.at(2).toDouble();
        mag.append(x) = parts.at(1).toDouble();
        num.append(y) = parts.at(2).toDouble();
 
    QVector<double> mag;
    QVector<double> num;
    ui->customplot->graph(0)->setData(x,y);
    ui->customplot->replot();
    ui->customplot->update();
}

void NetworkPlot::readData()
{
    qDebug() <<"Serialport works"; // it's ok (control port com)
    auto data = arduino->readAll(); // it's ok 
    ui->listWidget->addItem(QString(data)); // it's ok

    QString str = QString(data); // start of problem
    QStringList parts = str.split(" ");
    if (parts.size() == 2) {
        qDebug() << parts.at(1).toDouble() << parts.at(2).toDouble();
        mag.append(x) = parts.at(1).toDouble();
        num.append(y) = parts.at(2).toDouble();

    QVector<double> mag;
    QVector<double> num;
    ui->customplot->graph(0)->setData(x,y);
    ui->customplot->replot();
    ui->customplot->update();
}

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My first test;

void NetworkPlot::readData()
{
    qDebug() <<"Serialport works"; //ok
    auto data = arduino->readAll(); //ok
    ui->listWidget->addItem(QString(data)); //ok
    QVector<double> x,y; 
    ui->customplot->graph(0)->setData(x,y);
    ui->customplot->replot();
    ui->customplot->update();
}

void NetworkPlot::readData()
{
    qDebug() <<"Serialport works"; //ok
    auto data = arduino->readAll(); //ok
    ui->listWidget->addItem(QString(data)); //ok
    QVector<double> x,y; 
    ui->customplot->graph(0)->setData(x,y);
    ui->customplot->replot();
    ui->customplot->update();
}

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There is a formatting that totally escapes me and I spent hours testing. This is my first application in C++ and I only have knowledge in basic and arduino but it is progressing.

I specify that I am French-speaking and I translate my request.

Thank you for your help

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