Solved How can i get y value from a plotted QCustomPlot?
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Hi,
My data is already plotted on:
ui->cumstomPlot_1
And now i need to read this data (256 "y" values), sum each value ( from this y axis) and write a new file with this this code:
for(int i=0; i<257; ++i) { //Here I want to create a new double ("new_y") variable to receive the y value indexed by "i" (in this case my "x" axis) double r = QRandomGenerator::global()->bounded(-100,100); df<< QString("%1").arg(i) + "," + QString("%1").arg(new_y+(r/10)); df <<"\n"; qDebug() << r; } //from this point on, i know what I must have to do.
Thanks
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Hi,
Someone could help me, please!!! -
Hi
Actually QCustomPlot is not part of Qt and have its own support forum.
https://www.qcustomplot.com/index.php/support/forumWe would tell you if we knew but so far no user seems to know the answer here.
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Ok. Thanks.
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@mrjj I solved the problem and I will post here just in case someone needs:
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for (int i=0;i<256;++i){ double lastKey = (ui->customPlot_1->graph(0)->data()->at(i)->key); double lastValue = (ui->customPlot_1->graph(0)->data()->at(i)->value); qDebug () << "X:" << i << lastKey; qDebug () << "Y:" << i << lastValue; }
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Hi,
You can improve your access to the data using:
auto plotData = ui->customPlot_1->graph(0)->data(); for (int i = 0 ; i < plotData->size() ; ++i) { double lastKey = plotData->at(i)->key; double lastValue = plotData->at(i)->value); qDebug () << "X:" << i << lastKey; qDebug () << "Y:" << i << lastValue; }
Or use iterators.