Работа с экранной таблицей - нужна помощь

IsRun = true
class_code="QJSIM"
 
function main()
   t_id = AllocTable()  
     
   AddColumn(t_id, 1, "Оборот",       true, QTABLE_STRING_TYPE, 20)
   AddColumn(t_id, 2, "Бумага", true, QTABLE_DOUBLE_TYPE,   14)
   t = CreateWindow(t_id)
         
  local seclist = {}
  local valtod = {}
  local secstring = ""
  local iRowInOutTable = 1
  local list = {}
  local val = 0
  local sorttable = {}
  local i=1  
  
 --list = getClassesList()
 --message(list)
  seclist = getClassSecurities(class_code)
 
 mt = {}

  for SecCode in string.gmatch(seclist, "([^,]+)") do

  --InsertRow(t_id, 1)
 
 valtod = getParamEx(class_code, SecCode, "VALTODAY").param_value
  seccode = SecCode
  val = tonumber(valtod)
   mt[i] = {}     -- create a new row
      mt[i][1] = val
      mt[i][2] = seccode
  i=i+1
   end

table.sort(mt, function(a,b) return a[1] > b[1] end) 
for i=1, 32, 1 do
InsertRow(t_id, 1)
SetCell(t_id, iRowInOutTable, 1,  tostring(math_round(mt[i][1])), 1)
SetCell(t_id, iRowInOutTable, 2, mt[i][2], 0)  
  end
   
message(mt[1][1])
end

function math_round (num, idp)
   local mult = 10^(idp or 0)
   return math.floor(num * mult + 0.5) / mult  
end