public SharedFormulaGroup(SharedFormulaRecord sfr, CellReference firstCell)
{
if (!sfr.IsInRange(firstCell.Row, firstCell.Col))
{
throw new ArgumentException("First formula cell " + firstCell.FormatAsString()
+ " is not shared formula range " + sfr.Range.ToString() + ".");
}
_sfr = sfr;
_firstCell = firstCell;
int width = sfr.LastColumn - sfr.FirstColumn + 1;
int height = sfr.LastRow - sfr.FirstRow + 1;
_frAggs = new FormulaRecordAggregate[width * height];
_numberOfFormulas = 0;
}
