Unset raster data pointer in QwtPlotSpectrogram without deleting it?

[raphael.lencrerot]

Thank Uwe,
this is finally what I have done. I removed the QwtMatrixRasterData object from my IO class. I still have the QVector handled by this class.

Since the QVector content can change (user move somewhere else to see another slice, for instance in depth) do I have to call following code each time QVector is updated?

QwtMatrixRasterData* raster=dynamic_cast<QwtMatrixRasterData*>(spectro_seismic->data());
raster->setValueMatrix(seismic->data(),seismic->nx());

QwtMatrixRasterData* raster=dynamic_cast<QwtMatrixRasterData*>(spectro_seismic->data());
raster->setValueMatrix(seismic->data(),seismic->nx());

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I tried without but the updated content was not ploted.

Thank again.