新手学习编写指标，求达人指教
你的 arrUpper[i] +arrLower[i] =0 你确定你的arrA1[i] = (arrUpper[i]-arrMa9[i])/(arrMa9[i]-arrLower[i]); 没有写错？
2010.11.09 15:23:56 test EURUSD,H1: zero divide
你有没发现，你的纵坐标数值？
900000 到-900000
你的 你确定你的arrA1[i] = (arrUpper[i]-arrMa9[i])/(arrMa9[i]-arrLower[i]); 没有写错？
2010.11.09 15:23:56 test EURUSD,H1: zero divide
你有没发现，你的纵坐标数值？
900000 到-900000
arrUpper[i] +arrLower[i] =0 这个等于0吗？
//+------------------------------------------------------------------+
//| test.mq4 |
//| Copyright ?2010, MetaQuotes Software Corp. |
//| https://www.metaquotes.net// |
//+------------------------------------------------------------------+
#property copyright "Copyright ?2010, MetaQuotes Software Corp."
#property link "https://www.metaquotes.net//"
#property indicator_separate_window
//+------------------------------------------------------------------+
//| Custom indicator initialization function |
//+------------------------------------------------------------------+
//+------------------------------------------------------------------+
//| Custom indicator initialization function |
//+------------------------------------------------------------------+
#property indicator_buffers 2
#property indicator_color1 Red
#property indicator_color2 Red
double arrA1[];
double arrA2[];
int init()
{
SetIndexStyle(0,DRAW_LINE);
SetIndexStyle(1,DRAW_LINE);
IndicatorDigits(Digits+1);
//---- indicator buffers mapping
SetIndexBuffer(0,arrA1);
SetIndexBuffer(1,arrA2);
//---- name for DataWindow and indicator subwindow label
SetIndexLabel(0,"First");
SetIndexLabel(1,"Seconds");
}
//+------------------------------------------------------------------+
//| Custom indicator iteration function |
//+------------------------------------------------------------------+
int start()
{
int counted_bars=IndicatorCounted();
//----
double arrMa26[], arrUpper[], arrLower[], arrMa9[];//, arrA1[];
int iArrLen, i, cnt, ticket, total;
if(counted_bars>0) counted_bars--;
iArrLen=Bars-counted_bars;
for( i=0; i<iArrLen; i++ )
{
arrMa26[i] = iMA(NULL,0,26,0,MODE_SMMA,PRICE_MEDIAN,i);
arrMa9[i] = iMA(NULL,0,9,0,MODE_SMMA,PRICE_MEDIAN,i);
arrA1[i] = arrMa26[i] + 2.7*iStdDev(NULL,0,26,0,MODE_SMMA,PRICE_MEDIAN,i); /////arrUpper
arrA2[i] = arrMa9[i] - 2.7*iStdDev(NULL,0,26,0,MODE_SMMA,PRICE_MEDIAN,i);/////arrLower
//arrA1[i] = (arrUpper[i]-arrMa9[i])/(arrMa9[i]-arrLower[i]);
}
//for( i=0; i<iArrLen; i++ )
//{
//arrA2[i] = ( MathAbs(arrA1[i-2])+MathAbs(arrA1[i-1])+MathAbs(arrA1[i]) )/3;
//}
//----
return(0);
}
//+------------------------------------------------------------------+
你试试这个代码 arrUpper[i] 和 arrLower[i] 图形是对称的。相加是0的。
确实啊，这太奇怪了啊，一个是26日均线，一个是9日，怎么会这样呢？
很感谢star老大的指教，明白了很多东西，还有下面一个疑问：
线段A1已经可以画出来了，为什么A2不行呢？
//+------------------------------------------------------------------+
//| test.mq4 |
//| Copyright ?2010, MetaQuotes Software Corp. |
//| https://www.metaquotes.net// |
//+------------------------------------------------------------------+
#property copyright "zys"
#property link ""
#property indicator_separate_window
//+------------------------------------------------------------------+
//| Custom indicator initialization function |
//+------------------------------------------------------------------+
//+------------------------------------------------------------------+
//| Custom indicator initialization function |
//+------------------------------------------------------------------+
#property indicator_buffers 3
#property indicator_color1 Red
#property indicator_color2 Red
#property indicator_color3 Blue
double arrUpper[];
double arrLow[];
double arrA1[];
double arrA2[];
int iArrLen;
int init()
{
SetIndexStyle(0,DRAW_LINE);
SetIndexStyle(1,DRAW_LINE);
SetIndexStyle(2,DRAW_LINE);
IndicatorDigits(Digits+1);
//---- indicator buffers mapping
SetIndexBuffer(0,arrUpper);
SetIndexBuffer(1,arrLow);
SetIndexBuffer(2,arrA2);
//---- name for DataWindow and indicator subwindow label
SetIndexLabel(0,"Upp");
SetIndexLabel(1,"Low");
SetIndexLabel(2,"A2");
}
//+------------------------------------------------------------------+
//| Custom indicator iteration function |
//+------------------------------------------------------------------+
int start()
{
int counted_bars=IndicatorCounted();
//----
double arrMaMax[], arrMaMin[];
int i, cnt, ticket, total;
int iMax = 26, iMin = 9;
if(counted_bars>0) counted_bars--;
iArrLen=Bars-counted_bars;
//iArrLen=Bars;
for( i=0; i<iArrLen; i++ )
{
arrMaMax[i] = iMA(NULL,0,iMax,0,MODE_SMA,PRICE_MEDIAN,i);
arrMaMin[i] = iMA(NULL,0,iMin,0,MODE_SMA,PRICE_MEDIAN,i);
arrUpper[i] = arrMaMax[i] + 2.7*iStdDev(NULL,0,iMax,0,MODE_SMA,PRICE_MEDIAN,i); /////arrUpper
arrLow[i] = arrMaMax[i] - 2.7*iStdDev(NULL,0,iMin,0,MODE_SMA,PRICE_MEDIAN,i);/////arrLower
arrA1[i] = (MathAbs(arrUpper[i]-arrMaMin[i])/(arrMaMin[i]-arrLow[i]))/3;
}
arrA2[0] = 0;
arrA2[1] = 0;
for( i=2; i<iArrLen; i++ )
{
arrA2[i] = arrA1[i-2]+arrA1[i-1]+arrA1[i];
//arrA2[i] = iMAOnArray(arrA1,0,3,0,MODE_SMA,i);
}
//----
return(0);
}
//+------------------------------------------------------------------+
我也发现了！！
发现一个问题就是 当第一次编译运行程序时候 iArrLen=5000+
然后第二次运行时候就是2了。
由此可知道MT4历史数据相当于初始化一次，然后，价格变动时候，只是变动最近2个周期或者多长时间的
你可以Alert(Bars-counted_bars); Alert(iArrLen )；调用看看。
出现错误
| ERR_ARRAY_INDEX_OUT_OF_RANGE | 4002 | 企图获取数组项目，其中一些是出于数组范围 |
你在程序最后
for( i=2; i<iArrLen; i++ )
{
arrA2[i] = arrA1[i-2]+arrA1[i-1]+arrA1[i];
//arrA2[i] = iMAOnArray(arrA1,0,3,0,MODE_SMA,i);
}
Print("error:"+GetLastError());
//----
return(0);
就会看到错误信息了。
我想写一个指标，完成下面的功能，但是自己根据看mql4的帮助写的程序，编译ok，但是加载后无反应，求达人指教。
功能：
1、ma26=26日中间价均线；
2、ma9= 9日中间均价；
3、upp = ma26 + 2.7*26日标准方差；
4、low = ma9 - 2.7*26日标准方差；
5、a1 =( upp -ma9 ) / (ma9 - low );
6、a2 = 前3日a1的均值；
7、在附图上画出a2线段；
代码如下：
double arrA2[];
//+------------------------------------------------------------------+
//| Custom indicator initialization function |
//+------------------------------------------------------------------+
int init()
{
SetIndexStyle(0,DRAW_HISTOGRAM);
SetIndexStyle(1,DRAW_LINE);
SetIndexDrawBegin(1,9);
IndicatorDigits(Digits+1);
//---- indicator buffers mapping
SetIndexBuffer(0,arrA2);
//---- name for DataWindow and indicator subwindow label
IndicatorShortName("A2:");
SetIndexLabel(1,"A2");
return(0);
}
//+------------------------------------------------------------------+
//| Custom indicator iteration function |
//+------------------------------------------------------------------+
int start()
{
int counted_bars=IndicatorCounted();
//----
double arrMa26[], arrUpper[], arrLower[], arrMa9[], arrA1[];
int iArrLen, i, cnt, ticket, total;
if(counted_bars>0) counted_bars--;
iArrLen=Bars-counted_bars;
for( i=0; i<iArrLen; i++ )
{
arrMa26[i] = iMA(NULL,0,26,0,MODE_SMMA,PRICE_MEDIAN,i);
arrMa9[i] = iMA(NULL,0,9,0,MODE_SMMA,PRICE_MEDIAN,i);
arrUpper[i] = arrMa26[i] + 2.7*iStdDev(NULL,0,26,0,MODE_SMMA,PRICE_MEDIAN,i);
arrLower[i] = arrMa9[i] - 2.7*iStdDev(NULL,0,26,0,MODE_SMMA,PRICE_MEDIAN,i);
arrA1[i] = (arrUpper[i]-arrMa9[i])/(arrMa9[i]-arrLower[i]);
}
for( i=2; i<iArrLen; i++ )
{
arrA2[i] = ( MathAbs(arrA1[i-2])+MathAbs(arrA1[i-1])+MathAbs(arrA1[i]) )/3;
}
//----
return(0);
}
//+------------------------------------------------------------------+