2.7 Use of indicators

Use of indicators

• TA - Optimized partial rewrite of common indicator libraries

TA 指标库
MACD       指数平滑异同平均线
KDJ        随机指标
RSI        强弱指标
ATR        平均真实波幅
OBV        能量潮
MA         移动平均线
EMA        指数平均数指标
BOLL       布林带
Alligator  Alligator Indicator
CMF        蔡金货币流量指标
Highest    周期最高价
Lowest     周期最低价

Let's try to write a test with MACD indicator, before we open the MACD label in the API documentation and see the specific description.

If you are interested in DIF, DEA, indicator algorithms, etc., you can go to Baidu and search for MACD algorithms, there are many resources, well-packaged interfaces, we have them ready to use.

function main(){
    var records = null;
    var macd = null;
    while(true){
        records = _C(exchange.GetRecords);  // 获取K线数据 ，默认为策略界面设置的K线周期， _C 是一个容错的内置函数。
                                            // _C 详见 https://www.fmz.com/bbs-topic/320  问题7。
        macd = TA.MACD(records);   // 不加参数的话，使用的是默认参数  12, 26, 9
        Log("macd[0]", macd[0]);   // DIF
        Log("macd[1]", macd[1]);   // DEA
        Log("macd[2]", macd[2]);   // MACD 
        Log("macd[0]长度", macd[0].length);   // DIF 长度
        Log("macd[1]长度", macd[1].length);   // DEA 长度
        Log("macd[2]长度", macd[2].length);   // MACD 长度
        Log("records 长度：", records.length);  // 显示一下 records 的长度。
        Sleep(1000 * 60 * 5);
    }
}

The results of the analogue test:

As you can see, all of the calculated indicators are null at the beginning, and the data that follows has a specific value, because the calculation cycle specified by the indicator parameter cannot be calculated until the data volume (records data) does not meet this cycle. Therefore, it is important to understand the description of the indicator before using the indicator; and in the program to determine the length of the K-line data used to calculate the indicator; so as not to calculate an invalid value if the length is insufficient, and use an invalid value will cause a program error.

Below we use a chart interface to display the calculated indicator on the chart and compare it to the real-time chart of the exchange (OKCoin is selected on the real-time chart):

var ChartCfg = {
tooltip: {xDateFormat: '%Y-%m-%d %H:%M:%S, %A'},
    chart: { zoomType:'x',panning:true },//图表类型  
    title: { text: "K-macd"}, //标题
    rangeSelector: {
            buttons:  [{type: 'hour',count: 1, text: '1h'}, {type: 'hour',count: 3, text: '3h'}, {type: 'hour', count: 8, text: '8h'}, {type: 'all',text: 'All'}],
            selected: 0,
            inputEnabled: false
        },
    subtitle: {text: "测试macd"},//副标题
    xAxis:{type: 'datetime'},
    yAxis: [{
            title: {text: 'K线'},//标题
            style: {color: '#4572A7'},//样式 
            opposite: false  //生成右边Y轴
        },
       {
            title:{text: "macd"},
            opposite: true  //生成右边Y轴  ceshi
       }
    ],
    series: [//系列
        {type:'candlestick',yAxis:0,name:'K',id:'KLine',data:[]},
        {name:"DIF",type:'spline',yAxis:1,data:[]},
        {name:"DEA",type:'spline',yAxis:1,data:[]},
        {name:"MACD量柱",type:'spline',yAxis:1,data:[]},
        ]                  
};
function main(){
    var records = null;
    var macd = null;
    var perRecords = _C(exchange.GetRecords);
    var perRecordTime = perRecords[perRecords.length - 1].Time;
    var chart_obj = Chart(ChartCfg); // 初始化图表
    chart_obj.reset();
    while(true){
        records = _C(exchange.GetRecords);  // 获取K线数据 ，默认为策略界面设置的K线周期， _C 是一个容错的内置函数。
        if(!records && records.length < 26 ){
            continue;
        }
        macd = TA.MACD(records, 12, 26, 9);   // 不加参数的话，使用的是默认参数  12, 26, 9
        if(records[records.length - 1].Time !== perRecordTime){                                    // _C 详见 https://www.fmz.com/bbs-topic/320  问题7。
            //先更新，再添加K线
            chart_obj.add(0, [records[records.length - 2].Time, records[records.length - 2].Open, records[records.length - 2].High, records[records.length - 2].Low, records[records.length - 2].Close], -1);   // 跟新刚完成的bar。
            chart_obj.add(0, [records[records.length - 1].Time, records[records.length - 1].Open, records[records.length - 1].High, records[records.length - 1].Low, records[records.length - 1].Close]);       // 添加新出现的bar
            //先更新，添加指标线
            chart_obj.add(1, [records[records.length - 2].Time, macd[0][records.length - 2]], -1);   // 更新
            chart_obj.add(1, [records[records.length - 1].Time, macd[0][records.length - 1]]);
            
            chart_obj.add(2, [records[records.length - 2].Time, macd[1][records.length - 2]], -1);   // 更新
            chart_obj.add(2, [records[records.length - 1].Time, macd[1][records.length - 1]]);
            
            chart_obj.add(3, [records[records.length - 2].Time, macd[2][records.length - 2]], -1);   // 更新
            chart_obj.add(3, [records[records.length - 1].Time, macd[2][records.length - 1]]);
            
            perRecordTime = records[records.length - 1].Time;
        }else{
            //只更新当前的bar 和 线
            chart_obj.add(0, [records[records.length - 1].Time, records[records.length - 1].Open, records[records.length - 1].High, records[records.length - 1].Low, records[records.length - 1].Close], -1);
            chart_obj.add(1, [records[records.length - 1].Time, macd[0][records.length - 1]], -1);   // 更新
            chart_obj.add(2, [records[records.length - 1].Time, macd[1][records.length - 1]], -1);   // 更新
            chart_obj.add(3, [records[records.length - 1].Time, macd[2][records.length - 1]], -1);   // 更新
        }
        chart_obj.update(ChartCfg);
        Sleep(1000);
    }
}

The K-line cycle parameter on the robot interface is set to 1 minute, so a slightly smaller cycle is selected because it takes a while to run to see the effect.

As seen from the graph The inventor quantified The robot ran The calculated DIF is about 2.729 and the DEA is about 2.646 The MACD volume column is about 0.0831 The actual OKCoin exchange chart shows a DIF of 2.73, a DEA of 2.65, and a MACD of 0.17 As you can see, the difference between the first two DIFs, DEAs, OKCoin is very small, OKCoin is four-fifths, MACD is twice as bad, because OKCoin is calculated like this: (DIF - DEA) * 2, usually DIF - DEA = 2.729 - 2.646 = 0.083, if multiplied by 2 again, 0.166 is approximately equal to 0.17.

Other indicators are used in a similar manner.

• talib - http://ta-lib.org/

  In addition to the indicators commonly used in TA, there are many other indicators in the talib library. For example, let's try using the indicator talib.STOCHRSI, and look at the API documentation description:

STOCHRSI	Stochastic Relative Strength Index
STOCHRSI(Records[Close],Time Period = 14,Fast-K Period = 5,Fast-D Period = 3,Fast-D MA = 0) = [Array(outFastK),Array(outFastD)]

As you can see, the parameter setting is talib.STOCHRSI ((records, 14, 14, 3, 3); basically still top MACD-like code, with some changes, run and see.

var ChartCfg = {
tooltip: {xDateFormat: '%Y-%m-%d %H:%M:%S, %A'},
    chart: { zoomType:'x',panning:true },//图表类型  
    title: { text: "stochrsi"}, //标题
    rangeSelector: {
            buttons:  [{type: 'hour',count: 1, text: '1h'}, {type: 'hour',count: 3, text: '3h'}, {type: 'hour', count: 8, text: '8h'}, {type: 'all',text: 'All'}],
            selected: 0,
            inputEnabled: false
        },
    subtitle: {text: "测试stochrsi"},//副标题
    xAxis:{type: 'datetime'},
    yAxis: [{
            title: {text: 'K线'},//标题
            style: {color: '#4572A7'},//样式 
            opposite: false  //生成右边Y轴
        },
       {
            title:{text: "K-D"},
            opposite: true  //生成右边Y轴  ceshi
       }
    ],
    series: [//系列
        {type:'candlestick',yAxis:0,name:'K',id:'KLine',data:[]},
        {name:"K",type:'line',yAxis:1,data:[]},
        {name:"D",type:'line',yAxis:1,data:[]},
        ]                  
};
function main(){
    var records = null;
    //var macd = null;
    var stochrsi = null;
    var perRecords = _C(exchange.GetRecords);
    var perRecordTime = perRecords[perRecords.length - 1].Time;
    var chart_obj = Chart(ChartCfg); // 初始化图表
    chart_obj.reset();
    while(true){
        records = _C(exchange.GetRecords);  // 获取K线数据 ，默认为策略界面设置的K线周期， _C 是一个容错的内置函数。
        if(!records && records.length < 26 ){
            continue;
        }
        //macd = TA.MACD(records, 12, 26, 9);   // 不加参数的话，使用的是默认参数  12, 26, 9
        stochrsi = talib.STOCHRSI(records, 14, 5, 3, 0);
        if(records[records.length - 1].Time !== perRecordTime){                                    // _C 详见 https://www.fmz.com/bbs-topic/320  问题7。
            //添加K线
            chart_obj.add(0, [records[records.length - 2].Time, records[records.length - 2].Open, records[records.length - 2].High, records[records.length - 2].Low, records[records.length - 2].Close], -1);   // 跟新刚完成的bar。
            chart_obj.add(0, [records[records.length - 1].Time, records[records.length - 1].Open, records[records.length - 1].High, records[records.length - 1].Low, records[records.length - 1].Close]);       // 添加新出现的bar
            //添加指标线
            chart_obj.add(1, [records[records.length - 2].Time, stochrsi[0][records.length - 2]], -1);   // 更新
            chart_obj.add(1, [records[records.length - 1].Time, stochrsi[0][records.length - 1]]);
            
            chart_obj.add(2, [records[records.length - 2].Time, stochrsi[1][records.length - 2]], -1);   // 更新
            chart_obj.add(2, [records[records.length - 1].Time, stochrsi[1][records.length - 1]]);
            
            perRecordTime = records[records.length - 1].Time;
        }else{
            //只更新当前的bar 和 线
            chart_obj.add(0, [records[records.length - 1].Time, records[records.length - 1].Open, records[records.length - 1].High, records[records.length - 1].Low, records[records.length - 1].Close], -1);
            chart_obj.add(1, [records[records.length - 1].Time, stochrsi[0][records.length - 1]], -1);   // 更新
            chart_obj.add(2, [records[records.length - 1].Time, stochrsi[1][records.length - 1]], -1);   // 更新
        }
        chart_obj.update(ChartCfg);
        LogStatus("倒数第一组数据：", stochrsi[0][stochrsi[0].length - 1], stochrsi[1][stochrsi[1].length - 1], "    倒数第二组数据：", stochrsi[0][stochrsi[0].length - 2], stochrsi[1][stochrsi[1].length - 2]);
        Sleep(1000);
    }
}

I didn't show a screenshot, but there is a difference between the official figures and OKCoin, and BOSS says that the implementation algorithm of the talib library may be different from OKCoin.Understanding the STOCHRSI indicatorI'm writing this without optimization, it's very inefficient, it runs very slowly, so let's learn.