Javascript 如何使用 table.setNum() 使用 p5js 迭代表的行

function saveAsCSV() {
  
  let simulationOutput = new p5.Table();

  let newRow = simulationOutput.addRow();
  
  simulationOutput.addColumn("Total Population");
  simulationOutput.addColumn("Human Population");
  simulationOutput.addColumn("Predator Population");
  simulationOutput.addColumn("Prey Population");
  simulationOutput.addColumn("Food Population");

  for(var i = 1; i<totalDynamic.length; i++){
    simulationOutput.addRow().setNum("Total Population", int(totalDynamic[i]));
  }
  
  for(let j = 1; j<predDynamic.length; j++){
    simulationOutput.setNum(j,1, int(predDynamic[j]));
    j++;
  }
  
  save(simulationOutput, month()+"/"+day()+"_T:"+hour()+":"+minute()+":"+second()+"_Simulation_Output.csv");
}

我希望将模拟的输出保存到一个.csv文件中，但似乎不能使用for循环迭代表的行.我使用的是p5.js

for(let j = 1; j<predDynamic.length; j++){
    simulationOutput.setNum(j,1, int(predDynamic[j]));
    j++;}

我得到以下错误:

Uncaught TypeError: Cannot read properties of undefined (reading 'setNum')
    at o.default.Table.setNum (p5.min.js:3:593463)
    at o.default.Element.saveAsCSV (predator_prey.js:255:22)
    at o.default.Element.<anonymous> (p5.min.js:3:429692)

问题是使用j进行迭代，但我看不出这是如何返回未定义的？