[vtkusers] Clearing vtkPlot object

[Maarten Beek]

Hi all,
Yesterday I started exploring the options to draw 2d graphs in VTK.

Why does
m_pChart->GetPlot(0)->SetInputData(0);
not remove the graph from my chart?

I am currently using 
vtkTable* table = m_pChart->GetPlot(0)->GetInput();if( 0 != table ){    while( 0  < table->GetNumberOfRows() )    {        table->RemoveRow(0);    }}
m_pChart->GetPlot(0)->GetData()->Modified(); // <- required!
This works, but complains about trying to draw a line with less than 2 points.
Thanks - Maarten
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