Open a FITS file whose primary array represents a spectrum table (flux vs wavelength) and dump its columns
Author: Claudi Martinez
This notebook tutorial was automatically generated with ROOTBOOK-izer from the macro found in the ROOT repository on Friday, March 24, 2023 at 10:53 AM.
We open a table from a FITS file and dump its columns.
TString dir = gROOT->GetTutorialDir();
Open the table
TFITSHDU hdu(dir + "/fitsio/sample4.fits[1]");
Info in <TFITSHDU::LoadHDU>: The selected HDU contains a Table Extension
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
Draw all canvases
gROOT->GetListOfCanvases()->Draw()