plot->enableAxis( QwtPlot::yRight );I would like to show a scale for the y Axis on the left as well as the right side of the plot canvas.
This depends on how you set your QwtPlot::Left axis.They should display exactly the same range etc.
If you don't assign it manually you can connect to the QwtScaleWidget::scaleDivChanged() signal and synchronize the right axis from the left one ( use QwtPlot::setAxisScaleDiv() ).
Uwe
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