not showing DotLine in a for loop setting Samples with Qvector

[Alex22]

Hi,

when I use a ForLoop for initialing a QVector<double>, and have a setPen like this:

curve.setPen(Qt::red, 4, Qt::DotLine)

curve.setPen(Qt::red, 4, Qt::DotLine)

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, the plot can not show the DotLine style. code is:

QVector<double> t(20);
    //t<<1<<2<<3<<4<<5<<6<<7<<8<<9; //if I replace this line with under ForLoop the problem is solved.
    for(int i=0;i<10;i++)
    {
        t[i]=i;
    }
    curve.setSamples(t,t );
    curve.setPen(Qt::red, 4, Qt::DotLine);
    curve.attach(&plot);
 
    plot.show();

QVector<double> t(20);
    //t<<1<<2<<3<<4<<5<<6<<7<<8<<9; //if I replace this line with under ForLoop the problem is solved.
    for(int i=0;i<10;i++)
    {
        t[i]=i;
    }
    curve.setSamples(t,t );
    curve.setPen(Qt::red, 4, Qt::DotLine);
    curve.attach(&plot);

    plot.show();

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I uploaded a picture of this. Thanks for any help
NotShowStyle.png