Version: qwt 6.0.1 I\'ve tried to develop logarithmic scaling for Spectrum. I\'ve used simple line to enable scaling plotspectrum->setAxisScaleEngine(QwtPlot::yLeft, new QwtLog1
I think you should be using:
new QwtLogScaleEngine(10)
The manual for QwtScaleEngine doesn't show any classes called QwtLog10ScaleEngine.
QwtLog10ScaleEngine