/data3/calcul/jacquem/working_dir/Micromegas/micromegasFrameWork/src/analyse/TB2010/Testbeam_june_10/Gassiplex/Beam_profile/gplexMapping/Y.C

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Short_t Y(Int_t chanNum)
{//valid for chanNum from 0 to 672 compatible with TB2008 setup (3 beta2 , 1 beta2.4)
  if (chanNum>=672||chanNum<0){cout<<"error in Y.C : unrecognized channel number :"<<chanNum<<"\n";return -1;}
  Short_t y;
  Short_t i = chanNum%96+1;
  Short_t mapp;
  if((i>0&&i<17)||(i>32&&i<49)||(i>64&&i<81)){mapp=2*i-((i/32)*32)-1;}
  if((i>16&&i<33)||(i>48&&i<65)||(i>80&&i<97)){mapp=66+(((3*i-1)/96)*96)-2*i;}
  if(chanNum/96<3)
    {//gassiplex 0, 1, 2
      y=(mapp-1)/6;
    }
  else
    {//gassiplex 3,4,5,6
      if((chanNum/96)-3==0)y=(mapp-1)/6;
      if((chanNum/96)-3==1)y=(mapp-1)/6 +16;
      if((chanNum/96)-3==2)y=15-(mapp-1)/6;
      if((chanNum/96)-3==3)y=31-(mapp-1)/6;
              //    ------------|
              //  __|     |     |__
              // [__|  2  |  0  |__] gassiplex 
              //    |     |     |
              //    |------------
              //  __|     |     |__
              // [__|  3  |  1  |__] gassiplex 
              //    |     |     |
              //    |------------
    }
  if(y<0||y>32){cout<<"error calculating y coordinate for channel "<<chanNum<<endl; return -1;}
  return y;
}

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