code: func (sh *Sheet) Cell(row, col int) *Cell {
  
  	// If the user requests a row beyond what we have, then extend.
  	for len(sh.Rows) <= row {
  		sh.AddRow()
  	}
  
  	r := sh.Rows[row]
  	for len(r.Cells) <= col {
  		r.AddCell()
  	}
  
  	return r.Cells[col]
  }
docs: // Get a Cell by passing it's cartesian coordinates (zero based) as
  // row and column integer indexes.
  //
  // For example:
  //
  //    cell := sheet.Cell(0,0)
  //
  // ... would set the variable "cell" to contain a Cell struct
  // containing the data from the field "A1" on the spreadsheet.