MathLog1p

double  MathLog1p(
   double  value      // 로그를 씌울 값
   );

#define GRAPH_WIDTH  750
#define GRAPH_HEIGHT 350
 
#include <Graphics\Graphic.mqh>
 
CGraphic ExtGraph;
//+------------------------------------------------------------------+
//| Script program start function                                    |
//+------------------------------------------------------------------+
void OnStart()
  {
//--- 1 스텝에서 0부터 8까지 9개의 값을 얻습니다.
   vector X(9,VectorArange);
   Print("vector X = \n",X);
//--- 각 벡터 값에 대해 표현식의 로그를 계산합니다(1 + X 벡터 값).
   X=MathLog1p(X);
   Print("MathLog1p(X) = \n",X);
   
//--- 계산된 값을 벡터에서 배열로 전송합니다.
   double y_array[];
   X.Swap(y_array);
 
//--- 계산된 벡터 값의 그래프를 그립니다.
   CurvePlot(y_array,clrDodgerBlue);
 
//--- Escape 또는 PgDn 키를 눌러 그래프를 삭제하고(스크린샷 하기) 종료할 때까지 기다립니다.
   while(!IsStopped())
     {
      if(StopKeyPressed())
         break;
      Sleep(16);
     }
 
//--- 모두 삭제
   ExtGraph.Destroy();
   /*
  결과:
   vector X = 
   [0,1,2,3,4,5,6,7,8]
   MathLog1p(X) = 
   [0,0.6931471805599453,1.09861228866811,1.386294361119891,1.6094379124341,1.791759469228055,1.945910149055313,2.079441541679836,2.19722457733622]
   */
  }
//+------------------------------------------------------------------+
//| '스텝' 증분 단위인 '값'으로 벡터 채우기                               |
//+------------------------------------------------------------------+
template<typename T> 
void VectorArange(vector<T> &vec,T value=0.0,T step=1.0) 
  { 
   for(ulong i=0; i<vec.Size(); i++,value+=step) 
      vec[i]=value; 
  }
//+------------------------------------------------------------------+
//| ESC를 누르면 'true'를 반환합니다                                    |
//| PgDn을 누르면 그래프 스크린샷을 찍고 'true'를 반환합니다               |
//| 그렇지 않으면 'false'를 반환 합니다                                 |
//+------------------------------------------------------------------+
bool StopKeyPressed()
  {
//--- ESC를 누르면 'true'를 반환합니다.
   if(TerminalInfoInteger(TERMINAL_KEYSTATE_ESCAPE)!=0)
      return(true);
//--- PgDn을 누르고 그래프 스크린샷이 성공적으로 촬영되면 'true'를 반환합니다
   if(TerminalInfoInteger(TERMINAL_KEYSTATE_PAGEDOWN)!=0 && MakeAndSaveScreenshot(MQLInfoString(MQL_PROGRAM_NAME)+"_Screenshot"))
      return(true);
//--- 'false'를 반환합니다 
   return(false);
  }
//+------------------------------------------------------------------+
//| 그래프 객체를 만들고 곡선 그리기                                     |
//+------------------------------------------------------------------+
void CurvePlot(double &x_array[], double &y_array[], const color colour)
  {
   ExtGraph.Create(ChartID(), "Graphic", 0, 0, 0, GRAPH_WIDTH, GRAPH_HEIGHT);
   ExtGraph.CurveAdd(x_array, y_array, ColorToARGB(colour), CURVE_LINES);
   ExtGraph.IndentUp(30);
   ExtGraph.CurvePlotAll();
stringtext1="그래프를 삭제하고 스크립트를 중지하려면 ESC를 누르십시오. 또는";
stringtext2=" 화면을 만들고 그래프를 삭제하고 스크립트를 중지하려면 PgDn을 누르세요";
   ExtGraph.TextAdd(54, 9, text1, ColorToARGB(clrBlack));
   ExtGraph.TextAdd(54,21, text2, ColorToARGB(clrBlack));
   ExtGraph.Update();
  }
//+------------------------------------------------------------------+
//| 스크린샷을 찍어 이미지를 파일로 저장                                  |
//+------------------------------------------------------------------+
bool MakeAndSaveScreenshot(const string file_name)
  {
   string file_names[];
   ResetLastError();
   int selected=FileSelectDialog("Save Picture", NULL, "All files (*.*)|*.*", FSD_WRITE_FILE, file_names, file_name+".png");
   if(selected<1)
     {
      if(selected<0)
         PrintFormat("%s: FileSelectDialog() function returned error %d", __FUNCTION__, GetLastError());
      return false;
     }
   
   bool res=false;
   if(ChartSetInteger(0,CHART_SHOW,false))
      res=ChartScreenShot(0, file_names[0], GRAPH_WIDTH, GRAPH_HEIGHT);
   ChartSetInteger(0,CHART_SHOW,true);
   return(res);
  }