能不能用mt4编写出这样的曲线EMA(MA(C,N),M)?

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我直接用公式里的EMA（）函数调用SMA（）发现不能够自动更新且数据运算量过大，应该是全局变量和局部变量的定义有问题吧？怎么解决呢？请教各位高手

[Hong Zhen Zou]

double ma[i]=iMA( string symbol, int timeframe, int period, int ma_shift, int ma_method, int applied_price, i )
double ema=iMAOnArray( ma[i], int total, int period, int ma_shift, int ma_method, int shift)

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big_one 写道 >>

double ma[i]=iMA( string symbol, int timeframe, int period, int ma_shift, int ma_method, int applied_price, i )
double ema=iMAOnArray( ma[i], int total, int period, int ma_shift, int ma_method, int shift)

你有试验过吗？我做了一次不能通过，能否做成一个完整的我测试一下？谢谢：）

[Hong Zhen Zou]

//+------------------------------------------------------------------+
//| aeetes.mq4 |
//| Copyright ?2008, MetaQuotes Software Corp. |
//| https://www.metaquotes.net/ |
//+------------------------------------------------------------------+
#property copyright "Copyright ?2008, MetaQuotes Software Corp."
#property link "https://www.metaquotes.net/"

#property indicator_chart_window
#property indicator_buffers 2
#property indicator_color1 Red
#property indicator_color2 MediumBlue
//---- input parameters
extern int Ext1=5;
extern int Ext2=10;
//---- buffers
double MaBuffer[];
double EmaBuffer[];
//+------------------------------------------------------------------+
//| Custom indicator initialization function |
//+------------------------------------------------------------------+
int init()
{
//---- indicators
SetIndexStyle(0,DRAW_LINE);
SetIndexBuffer(0,MaBuffer);
SetIndexStyle(1,DRAW_LINE);
SetIndexBuffer(1,EmaBuffer);
//----
return(0);
}
//+------------------------------------------------------------------+
//| Custom indicator deinitialization function |
//+------------------------------------------------------------------+
int deinit()
{
return(0);
}
//+------------------------------------------------------------------+
//| Custom indicator iteration function |
//+------------------------------------------------------------------+
int start()
{
int limit;
int counted_bars=IndicatorCounted();
if(Bars<=50) return(0);
//---- check for possible errors
if(counted_bars<0) return(-1);
//---- last counted bar will be recounted
if(counted_bars>0) counted_bars--;
limit=Bars-counted_bars;

//---- ma
for(int i=0; i<limit; i++)
{
MaBuffer[i]=iMA(NULL,0,Ext1,0,MODE_EMA, PRICE_MEDIAN, i) ;
}
//---- ema
for(i=0; i<limit; i++)
{
EmaBuffer[i]=iMAOnArray(MaBuffer, 0, Ext2, 0, MODE_SMA, i);
}
//----
return(0);
}

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big_one 写道 >>

//+------------------------------------------------------------------+
//| aeetes.mq4 |
//| Copyright ?2008, MetaQuotes Software Corp. |
//| https://www.metaquotes.net/ |
//+------------------------------------------------------------------+
#property copyright "Copyright ?2008, MetaQuotes Software Corp."
#property link "https://www.metaquotes.net/"

#property indicator_chart_window
#property indicator_buffers 2
#property indicator_color1 Red
#property indicator_color2 MediumBlue
//---- input parameters
extern int Ext1=5;
extern int Ext2=10;
//---- buffers
double MaBuffer[];
double EmaBuffer[];
//+------------------------------------------------------------------+
//| Custom indicator initialization function |
//+------------------------------------------------------------------+
int init()
{
//---- indicators
SetIndexStyle(0,DRAW_LINE);
SetIndexBuffer(0,MaBuffer);
SetIndexStyle(1,DRAW_LINE);
SetIndexBuffer(1,EmaBuffer);
//----
return(0);
}
//+------------------------------------------------------------------+
//| Custom indicator deinitialization function |
//+------------------------------------------------------------------+
int deinit()
{
return(0);
}
//+------------------------------------------------------------------+
//| Custom indicator iteration function |
//+------------------------------------------------------------------+
int start()
{
int limit;
int counted_bars=IndicatorCounted();
if(Bars<=50) return(0);
//---- check for possible errors
if(counted_bars<0) return(-1);
//---- last counted bar will be recounted
if(counted_bars>0) counted_bars--;
limit=Bars-counted_bars;

//---- ma
for(int i=0; i<limit; i++)
{
MaBuffer[i]=iMA(NULL,0,Ext1,0,MODE_EMA, PRICE_MEDIAN, i) ;
}
//---- ema
for(i=0; i<limit; i++)
{
EmaBuffer[i]=iMAOnArray(MaBuffer, 0, Ext2, 0, MODE_SMA, i);
}
//----
return(0);
}

这个写法有问题，因为会同时出现两条线，事实上，我们只需要其中的一条，也就是EmaBuffer[i]输出的图像，另外一条则是干扰，必须去掉才行，这里是否有命令可以不输出那条线呢？

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这个双线的问题已经解决，谢谢你。现在有个更进一步的问题，对布林带的优化。我希望布林带的上中下轨均可以通过上述类似双周期定义来优化他，在优化的过程中经常会出现不显示线条的问题，这个是什么原因呢？