向各位前辈高手请教公式问题，谢谢了。

郑美援 2008.04.25 17:35

向前辈高手们请教:
我在('Perry Kaufman AMA Optimized')下载了AMA optimized.mq4指标，有不明白的，还有想修改的。

1.不知道什么原因，它产生的均线总是与 Moving Averages 指标的相同周期的均线不一样？
2.输入的参数 nfast,nslow,G,dK是什么意思呢？
3.在('Perry Kaufman AMA Optimized')的指标说明里说，
------------------------------------------------------------------------------------------
“AMA_Trend_Type不等于零: 测量当前 AMA (AMA[0])值和前一个柱 (AMA[1]) AMA的值之间的差距。
deltaAMA=AMA[0]-AMA[1]. 趋势探测设定为 dK*点。
如果 deltaAMA>dK*点,随后趋势上升，蓝线将出现在 AMA上。
如果 deltaAMA<dK*点，随后趋势下降，红线将出现在 AMA上。”

“AMA_Trend_Type等于零: 在最后PeroidAMA柱上 AMA 数组的值被标准离差 StdAMA计算。
趋势探测在标准离差内作为 dK*StdAMA被设定。
如果 deltaAMA>dK*StdAMA, 随后趋势上升,蓝点显示在AMA线上。
如果 deltaAMA<dK*StdAMA, 随后趋势下降，红点显示在 AMA线上。”
------------------------------------------------------------------------------------------
原来均线是灰色的，出现趋势上升或下降时，均线AMA会被蓝点或红点所覆盖，其他情况时仍是灰色的均线。

我希望的是与原来指标的画法相反（如图），能行吗？附指标源码。

先谢谢诸位了，源码如下。

（注释的中文汉字都是乱码，我也不知道是啥意思）

//+------------------------------------------------------------------+
//| AMA optimized.mq4 |
//| Copyright ?2006, MetaQuotes Software Corp. |
//| Copyright ?2004, by konKop,wellx |
//+------------------------------------------------------------------+
#property copyright "Copyright ?2006, MetaQuotes Software Corp."
#property link "optimized by Rosh"

#property indicator_chart_window
#property indicator_buffers 3
#property indicator_color1 Gray
#property indicator_color2 Blue
#property indicator_color3 Red
//---- input parameters
extern int periodAMA=10;
extern double nfast=2.0;
extern double nslow=30.0;
extern double G=2.0;
extern double dK=2.0;
extern int PriceType=0; // 鲥磬, 铗觐蝾痤?耱痤栩?
extern int AMA_Trend_Type=1;
//PRICE_CLOSE 0 皱磬玎牮?
//PRICE_OPEN 1 皱磬铗牮?
//PRICE_HIGH 2 锑犟桁嚯? 鲥磬
//PRICE_LOW 3 惕龛爨朦磬 鲥磬
//PRICE_MEDIAN 4 佯邃? 鲥磬, (high+low)/2
//PRICE_TYPICAL 5 诣镨黜? 鲥磬, (high+low+close)/3
//PRICE_WEIGHTED 6 络忮眄? 鲥磬玎牮?, (high+low+close+close)/4

//---- buffers
double AMAbuffer[];
double upAMA[];
double downAMA[];
double AbsBuffer[];

double AMA2Buffer[];
double SumAMABuffer[];
double StdAMA[];

double slowSC,fastSC,dFS;

//+------------------------------------------------------------------+
//| 忸玮疣弪鲥眢 |
//+------------------------------------------------------------------+
double Price(int shift)
{
//----
double res;
//----
switch (PriceType)
{
case PRICE_OPEN: res=Open[shift]; break;
case PRICE_HIGH: res=High[shift]; break;
case PRICE_LOW: res=Low[shift]; break;
case PRICE_MEDIAN: res=(High[shift]+Low[shift])/2.0; break;
case PRICE_TYPICAL: res=(High[shift]+Low[shift]+Close[shift])/3.0; break;
case PRICE_WEIGHTED: res=(High[shift]+Low[shift]+2*Close[shift])/4.0; break;
default: res=Close[shift];break;
}
return(res);
}
//+------------------------------------------------------------------+
//| Custom indicator initialization function |
//+------------------------------------------------------------------+
int init()
{
//---- indicators
IndicatorBuffers(7);
SetIndexStyle(0,DRAW_LINE);
SetIndexBuffer(0,AMAbuffer);
SetIndexStyle(1,DRAW_ARROW,0,2);
SetIndexArrow(1,159);
SetIndexBuffer(1,upAMA);
SetIndexEmptyValue(1,0.0);
SetIndexStyle(2,DRAW_ARROW,0,2);
SetIndexArrow(2,159);
SetIndexBuffer(2,downAMA);
SetIndexEmptyValue(2,0.0);

SetIndexBuffer(3,AbsBuffer);
SetIndexBuffer(4,AMA2Buffer);
SetIndexBuffer(5,SumAMABuffer);
SetIndexBuffer(6,StdAMA);

slowSC=(2.0 /(nslow+1));
fastSC=(2.0 /(nfast+1));
dFS=fastSC-slowSC;

//----
return(0);
}
//+------------------------------------------------------------------+
//| Custom indicator deinitialization function |
//+------------------------------------------------------------------+
int deinit()
{
//----

//----
return(0);
}
//+------------------------------------------------------------------+
//| Custom indicator iteration function |
//+------------------------------------------------------------------+
int start()
{
int counted_bars=IndicatorCounted();
//----
int i,limit,limit2;
double Noise,ER,SSC;
double SredneeAMA,SumKvadratAMA;
double val1,val2;
double dipersion;
static bool debug=false;

if (debug) return;
if (counted_bars>0)
{
limit=Bars-counted_bars;
limit2=limit;
}
if (counted_bars==0)
{
ArrayInitialize(AMAbuffer,0);
ArrayInitialize(upAMA,0);
ArrayInitialize(downAMA,0);
ArrayInitialize(AbsBuffer,0);
ArrayInitialize(AMA2Buffer,0);
ArrayInitialize(SumAMABuffer,0);
ArrayInitialize(StdAMA,0);

limit=Bars-1;
/*
for (i=limit;i>=0;i--)
{
AMAbuffer[i]=0;
upAMA[i]=0;
downAMA[i]=0;
AbsBuffer[i]=0;
NoiseBuffer[i]=0;
ERBuffer[i]=0;
SSCBuffer[i]=0;
StdAMA[i]=0;
}
ArrayInitialize(,)
*/
limit2=Bars-periodAMA-1;
}
limit--;
limit2--;
//Print("limit=",limit);
//Print("项?Abs");
for (i=limit;i>=0;i--)
{
AbsBuffer[i]=MathAbs(Price(i)-Price(i+1));
}
//Print("项?Noise");
for (i=limit2;i>=0;i--)
{
Noise=iMAOnArray(AbsBuffer,0,periodAMA,0,MODE_SMA,i)*periodAMA;
if (Noise!=0) ER=MathAbs(Price(i)-Price(i+periodAMA))/Noise; else ER=0;
SSC=MathPow(ER*dFS+slowSC,G);
AMAbuffer[i]=Price(i)*SSC+AMAbuffer[i+1]*(1-SSC);
AMA2Buffer[i]=AMAbuffer[i]*AMAbuffer[i]+AMA2Buffer[i+1];// 磬赅镫桠噱?耋祆?赈噤疣蝾?捞?
SumAMABuffer[i]=SumAMABuffer[i+1]+AMAbuffer[i];
}
//Print("项?Std");
for (i=limit2;i>=0;i--)
{
val1=0;
val2=0;
SredneeAMA=(SumAMABuffer[i]-SumAMABuffer[i+periodAMA])/periodAMA;
SumKvadratAMA=AMA2Buffer[i]-AMA2Buffer[i+periodAMA];
dipersion=SumKvadratAMA/periodAMA-SredneeAMA*SredneeAMA;
if (dipersion<0)
{
StdAMA[i]=0;
//Print("悟痂鲟蝈朦磬 滂耧屦耔! 珥圜屙桢:",DoubleToStr(dipersion,8));
//Print("periodAMA=",periodAMA," Bars=",Bars," i=",i);
//Print("Bar;Price;AbsBuffer;AMAbuffer;AMA2Buffer;SumAMABuffer;SredneeAMA");
// Print(i,";",Price(i),";",AbsBuffer[i],";",AMAbuffer[i],";",AMA2Buffer[i],";",SumAMABuffer[i],";",(SumAMABuffer[i]-SumAMABuffer[i+periodAMA])/periodAMA);

if (IsTesting()&&false)
{
Print("Bar;Price;AbsBuffer;AMAbuffer;AMA2Buffer;SumAMABuffer;SredneeAMA");
for (int Z=Bars-1;Z>=i;Z--) Print(Z,";",Price(Z),";",AbsBuffer[Z],";",AMAbuffer[Z],";",AMA2Buffer[Z],";",SumAMABuffer[Z],";",(SumAMABuffer[Z]-SumAMABuffer[Z+periodAMA])/periodAMA);
}
//debug=true;

}
else StdAMA[i]=MathSqrt(dipersion);

if (AMA_Trend_Type!=0)
{
if (MathAbs(AMAbuffer[i]-AMAbuffer[i+1])>dK*Point)
{
if (AMAbuffer[i]-AMAbuffer[i+1]>0) val1=AMAbuffer[i];
else val2=AMAbuffer[i];
}
}
else
{
if (MathAbs(AMAbuffer[i]-AMAbuffer[i+1])>dK*StdAMA[i])
{
if (AMAbuffer[i]-AMAbuffer[i+1]>0) val1=AMAbuffer[i];
else val2=AMAbuffer[i];
}
}
upAMA[i]=val1;
downAMA[i]=val2;
}
//Print("青觐眵桦?);

//----
return(0);
}
//+------------------------------------------------------------------+

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