How to get to «qwt» prepared the correct scale of the axis «Y» schedule?
Like always: you can use autoscaling or explicitly assign a scale. See:

  • QwtPlot::setAxisScale
  • QwtPlot::setAxisScaleDiv
  • QwtPlot::setAxisAutoScale


The graph constructed by the library «Qwt». Axis «Y» a logarithmic scale. How to get rid of it (see picture "3.jpg")?
Don't know - you didn't write, what your application does so I can only guess: maybe you misunderstood the meaning of a parameter ?

Uwe