void PlotWeightedHistogram()
{
	// assume the active worksheet has two columns, first column contains value data, another column contains counts data.
	Worksheet wks = Project.ActiveLayer(); 
	if( wks )
	{
		DataRange dr;
		dr.Add(wks, 0, "Range1");
		dr.Add(wks, 1, "Range2");
		
		vector 		vValues;
		vector		vCounts;
		dr.GetData(&vValues, 0); // 1st range for Values data
		dr.GetData(&vCounts, 1); // 2nd range for Counts data
		
		vector vData;
		for(int ii=0; ii<vCounts.GetSize(); ii++)
		{
			vector vTemp;
			vTemp.SetSize(vCounts[ii]);
			vTemp = (double)vValues[ii];
			vData.Append(vTemp);			
		}
		
		// add a new column and put data from vData to it
		DataRange dr2;
		dr2.Add(wks, wks.AddCol(), "X");
		dr2.SetData(vData);
		
		// plot histogram
		GraphPage gp;
		gp.Create("HIST"); // HIST is the graph template for histogram plot
		
		GraphLayer gl = gp.Layers(-1); // get active layer
		int index = gl.AddPlot(dr2, IDM_PLOT_HISTOGRAM_TYPE);
		if(index >= 0)
		{
			out_str("Successfully plot histogram");
			gl.Rescale();
		}		
	}
}