# Michelangelo.mq4

```#property link "http://www.forex-instruments.info"
//+------------------------------------------------------------------+
//|                                               Michelangelo.mq4   |
//|                                                                  |
//|                                                                  |
//|  Algorithm:  Apply a H/L indicator like SMI, avg'd w/ power law  |
//|              lengths.   Then apply a Kaufman AMA filter.         |
//|              Then a 'signal' EMA.  Use crossover of this as      |
//|                                                                  |
//|  Idea:       Try to stay on the side of a trend but reverse      |
//|              quickly if there is a breakout.  KaufmanAMA can     |
//|              be made sensitive to those.                         |
//|                                                                  |
//+------------------------------------------------------------------+

#property indicator_separate_window
#property indicator_buffers 2
#property indicator_color1 White
#property indicator_color2 Red
#property indicator_level1 0
//---- input parameters

//
// Try these on M30 charts on trendy currencies.
// THESE PARAMETERS ARE NOT OPTIMIZED BY ANY MEANS.
//
// Brief run-down.  Structure is derived from "SMI" indicator.
//
// The first part, minkernel, maxkernel, and exponent
// correspond to the power-law averaging of relative position of self to
// highs and lows.   The underlying statistic is sort of like a "stochastic",
// the purpose of the averaging is to not be as dependent on a single, fixed lookback.
//
// The relative position and range series (kept separate here) are each subjected
// to a Kaufman adaptive moving average.  This AMA computes an internal 'signal to noise'
// ratio to see if it is choppy (no consistent trend), in which case the smoothing is strong
// and laggy, or if it feels like a continuing trend, in which case the smoothing is light
// and fast.  Parameters here are "periodAMA", which is the lookback for S/N, nfast, and nslow
// which control the range between fastest and slowest smoothing, and "G".  This is an exponent
// which, for larger values than '1', more greatly emphasize the high S/N versus low.  In practice,
// this means that for larger 'G', there are more flat periods, and then more sensitive to breakouts.
//
// After the KaufmanAMA filtering, the two series are
// "predictively EMA filtered" (similar to a Hull MA), with parameter Period_R,
// and then divided to form the main indicator line in white.
//
// Finally, this indicator line is filtered with a conventional EMA with period 'Signal'
// to give the red signal line.  Trading signals are generally a crossover of white
// with red, with the slope of the white in the proper direction.    This will probably
// require intra-bar consideration for breakouts when used in real-time trading.
//
// Best nutshell description is "a bastardized sort of trend-following stochastic",
// or otherwise "WTF?".  But it does occasionally seem to show some nice signals
// on trendy currencies.   Probably not good on choppy USD/CAD or highly reversing crosses.

//
// PLEASE EXPERIMENT WITH PARAMETERS HEAVILY.
// There is nothing sacred with these.
// They have quite distinct effects depending on the setting, timescale and their values.

extern int       minkernel=2;
extern int       maxkernel=80;
extern double    Exponent=1.0;
int    KernelLength;
double kernel[];
double working[];

extern int       Period_R=3;
extern int       periodAMA=12;
extern int       nfast=6;
extern int       nslow=60;
extern double    G=2.5;

extern int       Signal=5;
//extern int       SignalShift=0;
//---- buffers
double SMI_Buffer[];
double Signal_Buffer[];
double SM_Buffer[];
double EMA_SM[];
double EMA2_SM[];
double EMA_HQ[];
double EMA2_HQ[];
double HQ_Buffer[];
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int init()
{
//---- indicators
IndicatorBuffers(8);
SetIndexStyle(0,DRAW_LINE);
SetIndexBuffer(0,SMI_Buffer);
SetIndexStyle(1,DRAW_LINE);
SetIndexBuffer(1,Signal_Buffer);
SetIndexLabel(0,"Michelangelo");
SetIndexLabel(1,"Signal Michelangelo");
SetIndexBuffer(2,SM_Buffer);
SetIndexBuffer(3,EMA_SM);
SetIndexBuffer(4,EMA2_SM);
SetIndexBuffer(5,EMA_HQ);
SetIndexBuffer(6,EMA2_HQ);
SetIndexBuffer(7,HQ_Buffer);

IndicatorShortName("Michelangelo(PL["+minkernel+","+maxkernel+"],"+periodAMA+","+nfast+","+nslow+","+G+","+Signal+")");
//----
KernelLength= maxkernel+1;
initialize_kernel(minkernel,maxkernel,KernelLength,Exponent);
ArrayResize(working,KernelLength);
return(0);
}
//+------------------------------------------------------------------+
//| Custor indicator deinitialization function                       |
//+------------------------------------------------------------------+
int deinit()
{

//----
return(0);
}
//+------------------------------------------------------------------+
//| Custom indicator iteration function                              |
//+------------------------------------------------------------------+
int start()
{
int    counted_bars=IndicatorCounted();
int limit;
int i;
if(counted_bars<0) return(-1);
if(counted_bars>0) counted_bars--;
limit=Bars-maxkernel-counted_bars;
if(counted_bars>0) counted_bars--;
for (i=limit;i>=0;i--)
{

for (int j=minkernel; j<=maxkernel; j++) {
double H = High[Highest(NULL,0,MODE_HIGH,j,i)];
double L = Low[Lowest(NULL,0,MODE_LOW,j,i)];
working[j] = (H-L);
}
HQ_Buffer[i] = convolve(working,kernel,minkernel,maxkernel);
for (j=minkernel; j<=maxkernel; j++) {
H = High[Highest(NULL,0,MODE_HIGH,j,i)];
L = Low[Lowest(NULL,0,MODE_LOW,j,i)];
double C= Close[i];

if (C < L) C = L;
if (C > H) C = H;

working[j] = C - (H+L)/2.0;
}
SM_Buffer[i] = convolve(working,kernel,minkernel,maxkernel);
}

KaufmanOnArray(limit, SM_Buffer, EMA_SM, periodAMA, nfast, nslow, G);
KaufmanOnArray(limit, HQ_Buffer, EMA_HQ, periodAMA, nfast, nslow, G);
EMAPredictiveSmoothOnArray(limit, Period_R, Period_R, EMA_SM, EMA2_SM);
EMAPredictiveSmoothOnArray(limit, Period_R, Period_R, EMA_HQ, EMA2_HQ);

for (i=limit-1;i>=0;i--)
{
double val = 100*EMA2_SM[i]/0.5/EMA2_HQ[i];
if (val > 100.0) val = 100.0;
if (val < -100.0) val = -100.0;
SMI_Buffer[i]= val;
}

EMAOnArray(limit,2.0/(Signal+1.0),SMI_Buffer,Signal_Buffer);
for (i=limit-1; i>= 0; i--) {
val = Signal_Buffer[i];
if (val > 100.0) val = 100.0;
if (val < -100.0) val = -100.0;
Signal_Buffer[i] = val;
}
return(0);
}
//+------------------------------------------------------------------+

void KaufmanOnArray(int N, double input[], double& output[], int periodAMA, int nfast, int nslow, double G) {
// perform a Kaufman moving average on input[], saving to output[]
double slowSC=(2.0 /(nslow+1));
double fastSC=(2.0 /(nfast+1));
int    i;
double AMA0, AMA, signal, noise, ER, dSC,ERSC,wlxSSC;
//  double noise,noise0,AMA,AMA0,signal,ER;

int nmax = N - periodAMA-1;

AMA0 = input[nmax+1];
for (i=nmax; i >= 0; i--) {
// loop down
signal=MathAbs(input[i]-input[i+periodAMA]);
noise=0;
for(int j=0;j nmax;i--) {
output[i] = input[i];
}

}

void EMAPredictiveSmoothOnArray(int N, double L, double Lfinal, double input[], double& output[]) {
//
// This "predictive/smoothed" EMA is very much like the HMA (hull MA).
// This particular subroutine specializes to a single "L" (input length
// is short length), and no 'time ahead'.
//
// Idea: do an EMA with lengths L and 2*L, and extrapolate from difference.
// That is a 'zero-lag' estimator of position, but has noise.  Then
// Do EMA with length sqrt(Lfinal) for final smoothing.
double fastema[], slowema[], difference[];
ArrayResize(fastema,N);
ArrayResize(slowema,N);
ArrayResize(difference,N);

double fastp, finalp;

fastp = 2.0/(1.0+L);
finalp = 2.0/(1.0+MathSqrt(Lfinal));

EMAOnArray(N,fastp,input,fastema);
EMAOnArray(N,fastp,fastema,slowema);
for (int i=N; i>=0; i--) {
difference[i] = 2.0*fastema[i] - slowema[i];
}
EMAOnArray(N,finalp,difference,output);
}

void EMAOnArray(int N, double p, double input[], double& output[]) {
// Perform an "EMA" on array input[] with mixing parameter 'p'
// 0 < p < 1.
//
// p, conventionally is 2.0/(L+1.0) where L is the 'length' parameter.
// In an EMA, the length and thus 'p' need not be integers.
// initial value is input[N-1], and will set output[N-1] down to output[0].
//

double omp = 1.0-p;
double ema = input[N-1];
for (int i=N-1; i>=0; i--) {
double v = input[i];
ema = p*v + omp*ema;
output[i] = ema;
}
}

void initialize_kernel(int from, int to, int KernelLength, double PowerExponent) {
double kernelsum;
ArrayResize(kernel,KernelLength);

kernelsum = 0.0;
for (int i=from; i<=to; i++) {
kernel[i] = MathPow( (i)*0.01, -PowerExponent);
kernelsum += kernel[i];
}
for (i = from; i<=to; i++) {
kernel[i] = kernel[i] / kernelsum;
}
}
double convolve(double array[], double kernel[], int from, int to) {
// return sum(i=0..n-1) array[i]*kernel[i]
// conventionally kernel[*] sums to 1, but this is not enforced here.
double sum = 0.0;
for (int i=from; i        ```