Yes using QwtRasterData - QwtMatrixRasterData is derived from it - is the right way to pass your data. Maybe have a look at the spectrogram example.
Uwe
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Re: How to plot my own data set in polar spectrogram example
Yes using QwtRasterData - QwtMatrixRasterData is derived from it - is the right way to pass your data. Maybe have a look at the spectrogram example.
Uwe
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