Google Apps Script入門
セルに数式を入れる

function mySample27_1() {
  var sheet = SpreadsheetApp.getActiveSheet()
  var lastRow,strformula
  lastRow = sheet.getLastRow()
  for (i=2; i<=lastRow; i++) {
    strformula = "=B" + i + "*C" + i
    sheet.getRange(i, 4).setValue(strformula) 
  }
}

function mySample27_2() {
  var sheet = SpreadsheetApp.getActiveSheet()
  var lastRow,strformula
  lastRow = sheet.getLastRow()
  for (i=2; i<=lastRow; i++) {
    strformula = "=B" + i + "*C" + i
    sheet.getRange(i, 4).setFormula(strformula)
  }
}

function mySample27_3() {
  var sheet = SpreadsheetApp.getActiveSheet()
  var lastRow
  lastRow = sheet.getLastRow()
  for (i=2; i<=lastRow; i++) {
    sheet.getRange(i, 4).setFormulaR1C1("=RC[-2]*RC[-1]")
  }
}

function mySample27_4() {
  var sheet = SpreadsheetApp.getActiveSheet()
  var lastRow
  lastRow = sheet.getLastRow()
  for (i=2; i<=lastRow; i++) {
    sheet.getRange(i, 4).setFormulaR1C1("=PRODUCT(RC[-2],RC[-1])")
  }
}