indicator oscillator problem

[faustf]

hi guys  i try to do an oscillator in separated windows  but   it draw  only a line  , where is the error  ?

thankz at all 

[Shino Unada]

for(int i=0; i<=(barsbackN-1); i++)
     {
      EmaA[i] =  iMAOnArray(ArrayDifN,0,smooth1,MA_Shift1,MODE_SMMA,Shift1);
     }
   for(int i=0; i<=(barsbackN-1); i++)
     {
      EmaB[i] =  iMAOnArray(EmaA,0,smooth1,MA_Shift1,MODE_SMMA,Shift1);
     }

// DENOMINATORE
   CopyClose(Symbol(),PERIOD_CURRENT,0,barsbackD,ArrayNClose);
   CopyOpen(Symbol(),PERIOD_CURRENT,0,barsbackD,ArrayNOpen);
   for(int i=0; i<=(barsbackD-1); i++)
     {
      ArrayDifD[i]= MathAbs((ArrayNOpen[i]-ArrayNClose[i]));
     }
   for(int i=0; i<=(barsbackD-1); i++)
     {
      EmaC[i] =  iMAOnArray(ArrayDifD,0,smooth2,MA_Shift2,MODE_SMMA,Shift2);
     }
   for(int i=0; i<=(barsbackD-1); i++)
     {
      EmaD[i] =  iMAOnArray(EmaC,0,smooth2,MA_Shift2,MODE_SMMA,Shift2);
     }