CODEWITHSUNDEEP
qtqwt
SamuelNLP
SamuelNLP

Reputation: 4136

qwtplot - adding data

QVector<double> x(101), y(101);
for (int i=0; i<101; ++i)
{
     x[i] = i/50.0 - 1;
     y[i] = x[i]*x[i];
}

QwtPlotCurve *curve;
curve->setData(x,y);
curve->attach(plot_all[0]);

Assuming plot_all[0] is my QwtPlot, what wrong here? It crashes my program, made in linux.

Upvotes: 0

Views: 1578

Answers (1)

Jason B
Jason B

Reputation: 12975

You are not allocating *curve so it does not point to a valid object. Try replacing QwtPlotCurve *curve with

QwtPlotCurve *curve = new QwtPlotCurve();

Upvotes: 2

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