BOOL AccessingArrayOfDatasets()
{
	Worksheet wks = Project.ActiveLayer(); // Get active worksheet layer
	if( wks.IsValid() ) // If wks is valid..
	{
		uint nCols = wks.Columns.Count(); // Get number of columns in worksheet
		nCols = nCols > 10 ? 10 : nCols; // Maximum number of columns is 10
		Dataset ards[10]; // Declare an array of datasets
		for( int ii = 0; ii < nCols; ii++ ) // For each column in worksheet...
		{
			ards[ii].Attach(wks, ii); // Attach to Dataset in ii-th column
			if( !ards[ii].IsValid() ) // Continue if attach fails
				continue;
			string strName = ards[ii].GetName(); // Get name of ii-th Dataset
			int iSize = ards[ii].GetSize(); // Get size of ii-th Dataset
			if( iSize > 0 )
			{
				double dFirstVal = ards[ii][0]; // Get first value of ii-th Dataset
				printf("Dataset %s has %d elements the first of which is %g\n", strName, iSize, dFirstVal);
			}
			else
				printf("Dataset %s has %d elements\n", strName, iSize);
		}
		return TRUE;
	}

	return FALSE;
}

void show_sel_stat()
{
	Worksheet wks = Project.ActiveLayer();
	if(!wks)
		return;
	
	int			 r1, c1,r2, c2;
	int			seltype = wks.GetSelectedRange(r1, c1, r2, c2);
	if(WKS_SEL_NONE == seltype)
		return;
	
	matrix mm;

	if(mm.CopyFromWks(wks, c1, c2, r1, r2))
	{
		printf("Selection %d x %d: mean = %f\n", mm.GetNumRows(), mm.GetNumCols(), mm.GetMean());
	}
}