;+
; NAME:
;  oc_convertid_tyc2_float
;
; PURPOSE: (one line)
;  Convert TY2 ID's from standard format to an internal floating-point format.
;
; DESCRIPTION:
;  Convert Tycho-2 ID's from standard format to an internal floating-point
;  format.  This floating-point format is used by the IDL occultation routines
;  to refer uniquely to Tycho-2 stars more easily than handling strings.
;
;  Tycho-2 ID's are in form "ZONE-SEQUENTIAL-NUM" (e.g., 2345-0312-1).
;  We return the value (ZONE*10^5) + (SEQUENTIAL) (e.g., 234500312.0);
;  we assume that the last component is always '1'.
;
;  This function is the opposite of oc_convertid_float_tyc2 .
;  
; CATEGORY:
;  Star catalogs
;  
; CALLING SEQUENCE:
;  id_float = oc_convertid_tyc2_float( IDs [, /VERBOSE])
;
; INPUTS:
;  IDs -- Tycho-2 ID(s).  String, or array of strings.  
;
; OPTIONAL INPUT PARAMETERS:
;  None
;  
; KEYWORD INPUT PARAMETERS:
;  /VERBOSE -- If set, print diagnostics to screen.
;
; KEYWORD OUTPUT PARAMETERS:
;  None
;
; OUTPUTS:
;  id_float -- floating-point representation of Tycho-2 ID's.
;    Scalar or array, with same size as input IDs.
;  
; COMMON BLOCKS:
;  None
;
; SIDE EFFECTS:
;  None
;
; RESTRICTIONS:
;  None
;
; EXAMPLE:
;  print, oc_convertid_tyc2_float(['0001-00017', '2345-312'])
;    [Prints "100017.00   2.3450031e+08"]
; 
; MODIFICATION HISTORY:
;  Written   3-Nov-2005 by Henry Throop, SwRI
;  Modified  7-Dec-2005 by HBT.  Improved error-handling.
;  Modified 27-Feb-2006 by HBT. Improved documentation and formatting.
;  Modified 14-Apr-2006 by Leslie Young. Made loop index long.
;-
function oc_convertid_tyc2_float, ids, VERBOSE=verbose

  num_ids	= sizex(ids)

  ids_out	= dblarr(num_ids)

  for i = 0L, num_ids-1 do begin
    id		= string(ids[i])
; If we have ' '
    if grep(id, ' ') then begin					
      id	= ht_str_split(id, char = ' ')
; Make an integer out of it, and chop the third element
      id	= id[0]*1d5 + id[1]				
    end
; If we have '-'
    if grep(id, '-') then begin					
      id	= ht_str_split(id, char = '-')
; Make an integer out of it, and chop the third element
      id	= id[0]*1d5 + id[1]				
    end
; If string, convert to double
    id		= double(id)					
    ids_out[i]	= id

; Check that it converted properly
    
    if (id eq 0) then begin
      if keyword_set(VERBOSE) then print, $
        'Error: oc_convertid_tyc2_float.pro: ' + ids[i] + $
        ' does not appear to be a valid TYC2 ID.'
    end

  end

; Return an array or a scalar, depending on what was passed in.

  if     is_array(ids)  then return, ids_out
  if not(is_array(ids)) then return, ids_out[0]

  return, ids_out
end