語法bug請教

再詢問一下，我把腳本調整了一下，但不知道為什麼昨日20MA( Average(close,20)[1] )竟然都是0 ?

Input: 
direction(0, "類型(0不限 1多方 2空方)");

settotalbar(1); // 我只要計算當天就好
SetBackBar(61); // 因應Average(close,60)[1] 而設定60+1


var:cnt(0); // 執行次數
var:upCnt(0); // 紅棒突破均線數量
var:downCnt(0); // 黑棒跌破均線數量
var:ma5(Average(close, 5)); // 5 MA
var:ma10(Average(close,10)); // 10 MA
var:ma20(Average(close,20)); // 20 MA
var:ma20prev(Average(close,20)[1]);//昨日月線
var:ma60(Average(close,60)); // 60 MA 季均線
var:ma20d(""); // 月線方向
var:kcolor(""); // K棒顏色


cnt = cnt +1;// 執行次數+1

// 長紅突破均線數
if close > ma5 and open < ma5 then upCnt = upCnt + 1; // 突破5MA
if close > ma10 and open < ma10 then upCnt = upCnt + 1; // 突破10MA
if close > ma20 and open < ma20 then upCnt = upCnt + 1; // 突破20MA
if close > ma60 and open < ma60 then upCnt = upCnt + 1; // 突破60MA

// 長黑跌破均線數
if close < ma5 and open > ma5 then downCnt = downCnt + 1; // 跌破5MA
if close < ma10 and open > ma10 then downCnt = downCnt + 1; // 跌破10MA
if close < ma20 and open > ma20 then downCnt = downCnt + 1; // 跌破20MA
if close < ma60 and open > ma60 then downCnt = downCnt + 1; // 跌破60MA

// 月線方向判斷
if ma20 > ma20prev then ma20d="上升";
if ma20 < ma20prev then ma20d="下跌";

// K棒顏色
if close > open then kcolor = "紅";
if close < open then kcolor = "黑";

outputfield1(upCnt,"突破均線數");
outputfield2(downCnt,"跌破均線數");
outputfield3(ma20d,"月線方向");
outputfield4(kcolor,"K棒顏色");

outputfield5(ma5,"5MA");
outputfield6(ma10,"10MA");
outputfield7(ma20,"20MA");
outputfield8(ma20prev,"昨20MA");
outputfield9(ma60,"60MA");
outputfield10(close,"收盤");
outputfield11(open,"開盤");
outputfield12(cnt,"執行次數");

Ret = (upCnt>=3 and direction <> 2) or (downCnt>=3 and direction <> 1);

還有XScrip介面有一個叫做執行的地方，這個地方要怎麼使用?