//set value
var array = [[1,2,3],[4,5],[6,7,8,9]];
activeSheet.setArray(1, 2, array);
//set formula
var array = [["=1+1","=2+2","=3+3"],["=4+4","=5+5"],["=6+6","=7+7","=8+8","=9+9"]];
activeSheet.setArray(1, 2, array, true);
//get value
var newArray = activeSheet.getArray(1, 2, 3, 4);
//getformula
var newArray = activeSheet.getArray(1, 2, 3, 4, true);
//alert(newArray[0]);