is it a C++ error or Qt/Qwt related?

[mcostalba]

Interestin enough delete[] works also from copied pointers, it means that you don't need

int samplesSize;

as member data but a local variable will suffice and freeData() became:

void Dialog::freeData()
{
     for(int i = 0; i < samplesPtr.size(); i++)
            delete[] samplesPtr.at(i);
}

void Dialog::freeData()
{
     for(int i = 0; i < samplesPtr.size(); i++)
            delete[] samplesPtr.at(i);
}

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