FITS_tutorial6.C File Reference

Detailed Description

Open a FITS file whose primary array represents a spectrum table (flux vs wavelength) and dump its columns

 
void FITS_tutorial6()
{
   // We open a table from a FITS file
   // and dump its columns.
 
   TString dir = gROOT->GetTutorialDir();
 
   //Open the table
   TFITSHDU hdu(dir + "/io/fitsio/sample4.fits[1]");
 
   // Show columns
   const auto nColumns = hdu.GetTabNColumns();
   printf("The table has %d columns:\n", nColumns);
   for (auto i : ROOT::TSeqI(nColumns)) {
      printf(" - Column %d: %s\n", i, hdu.GetColumnName(i).Data());
   }
}

 
The table has 8 columns:
 - Column 0: objId
 - Column 1: ra
 - Column 2: dec
 - Column 3: mag
 - Column 4: reddening
 - Column 5: objType
 - Column 6: mu_ra
 - Column 7: mu_dec

Author

Claudi Martinez

Definition in file FITS_tutorial6.C.