google apps script - How can I put the formula only in the last 20 rows of this range? -


i want code works in last 20 rows of sheet. sets formula in of blanks cells of column want code in 20 last rows.

   function setformulainblankcells()  { //----------------- colonna --------------- // formula solo su celle vuote "area"   var sheet=spreadsheetapp.getactivesheet();   var lastrow=sheet.getmaxrows();   var lastcolumn=sheet.getmaxcolumns();       var range=sheet.getrange(1, 1, lastrow, 1);   var data=range.getvalues();   for(var i=0;i<data.length;i++) {   if(!data[i][0])   {     var e1=sheet.getrange(i+1,5).geta1notation();     var i1=sheet.getrange(i+1,9).geta1notation();      var formula='=iferror(if(' + e1 + '="";"";if(' + i1 + '="";"ru";"st")))'      sheet.getrange(i+1,1).setformula(formula);    } }

}

i guess meant in last 20 rows of sheet

function setformulainblankcells()   {   var sheet=spreadsheetapp.getactivesheet();   var lastrow=sheet.getmaxrows();      var range=sheet.getrange(1, 1, lastrow, 1);   var data=range.getvalues();   for(var i=data.length-20;i<data.length;i++)   {     if(!data[i][0])     {       var e1=sheet.getrange(i+1,5).geta1notation();       var i1=sheet.getrange(i+1,9).geta1notation();        var formula='=iferror(if(' + e1 + '="";"";if(' + i1 + '="";"ru";"st")))'        sheet.getrange(i+1,1).setformula(formula);      }   }  }

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