docs: def _getcycle(self, cycle, decayed=False):
          ''' Private method for getting a cycle, called from get.'''
          yps=self.get('ABUNDANCE_MF', cycle)
          z=self.get('Z', cycle) #charge
          a=self.get('A', cycle) #mass
          isomers=self.get('ISOM', cycle)
  
          a_iso_to_plot,z_iso_to_plot,abunds,isotope_to_plot,el_iso_to_plot,isom=\
              self._process_abundance_vector(a,z,isomers,yps)
          self.a_iso_to_plot=a_iso_to_plot
          self.isotope_to_plot=isotope_to_plot
          self.z_iso_to_plot=z_iso_to_plot
          self.el_iso_to_plot=el_iso_to_plot
          self.abunds=array(abunds)
          self.isom=isom
  
          if decayed:
              try:
                  self.decay_idp
              except AttributeError:
                  print("WARNING: decayed in _getcycle ignores isomers " \
                      "and will decay alpha-unstable p-rich nuclei as if they were beta+ stable.")
                  print("Initialising decay index pointers ....")
                  self.decay_indexpointer() # provides self.decay_idp and
              ind_tmp=self.idp_to_stables_in_isostoplot
  
              isotope_decay=array(isotope_to_plot)[ind_tmp]
              z_iso_decay=array(z_iso_to_plot)[ind_tmp]
              a_iso_decay=array(a_iso_to_plot)[ind_tmp]
              el_iso_decay=array(el_iso_to_plot)[ind_tmp]
              abunds_decay=zeros(len(ind_tmp), dtype='float64')
              for i in range(len(isotope_to_plot)):
                  idp=where(isotope_decay==isotope_to_plot[self.decay_idp[i]])[0] # points from
                  # i on isotope_to_plot scale to decay target_on_decayed array scale
                  abunds_decay[idp] += abunds[i]
  
              if self.debug:
                  print("Decayed array:")
                  for i in range(len(ind_tmp)):
                      print(isotope_decay[i], z_iso_decay[i], a_iso_decay[i], el_iso_decay[i], abunds_decay[i])
  
              self.a_iso_to_plot=a_iso_decay
              self.isotope_to_plot=isotope_decay
              self.z_iso_to_plot=z_iso_decay
              self.el_iso_to_plot=el_iso_decay
              self.abunds=abunds_decay