Support Board

float GetHighest(SCFloatArrayRef In, int StartIndex, int Length)
{
  float High = -FLT_MAX;
  
  // Get the high from the last Length indexes in the In array
  for (int SrcIndex = StartIndex; SrcIndex > StartIndex - Length; --SrcIndex)
  {
    if (SrcIndex < 0 || SrcIndex >= In.GetArraySize())
      continue;
    
    if (In[SrcIndex] > High)
      High = In[SrcIndex];
  }
  
  return High;
}

float GetLowest(SCFloatArrayRef In, int StartIndex, int Length)
{
  float Low = FLT_MAX;
  
  // Get the low from the last Length indexes in the In array
  for (int SrcIndex = StartIndex; SrcIndex > StartIndex - Length; --SrcIndex)
  {
    if (SrcIndex < 0 || SrcIndex >= In.GetArraySize())
      continue;
    
    if (In[SrcIndex] < Low)
      Low = In[SrcIndex];
  }
  
  return Low;
}

SCFloatArrayRef WilliamsR2_S(SCFloatArrayRef InputDataHigh, SCFloatArrayRef InputDataLow, SCFloatArrayRef InputDataLast, SCFloatArrayRef Out, int Index, int Length)
{
  if(Index < Length)
    Out[Index]=0;
  else
  {
    float High = GetHighest(InputDataHigh,Index, Length);
    float Low = GetLowest(InputDataLow,Index,Length);
    Out[Index] = 100 * ( High-InputDataLast[Index]) / (High - Low);
  }

  return Out;
}