You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: t_getconsts.m
    path of file: ./repos/tracacode/1911-COAWST/script/mfiles/tides/t_tide
    
    the code of the file until where you have to start completion: function [const,sat,shallow]=t_getconsts(ctime);
% T_GETCONSTS Gets constituent data structures
% [CONST,SAT,SHALLOW]=T_GETCONSTS returns data structures holding
% information for tidal analyses.
%
% Variables are loaded from 't_constituents.mat', otherwise the 
% ascii files 'tide3.dat' (provided with the IOS analysis package)
% and 't_equilib.dat' are read, and the results stored in 
% 't_constituents.mat' for future use.
%
% [...]=T_GETCONSTS(TIME) recomputes the frequencies from the 
% rates-of-change of astronomical parameters at the matlab TIME given.

    
function [const,sat,shallow]=t_getconsts(ctime);
% T_GETCONSTS Gets constituent data structures
% [CONST,SAT,SHALLOW]=T_GETCONSTS returns data structures holding
% information for tidal analyses.
%
% Variables are loaded from 't_constituents.mat', otherwise the 
% ascii files 'tide3.dat' (provided with the IOS analysis package)
% and 't_equilib.dat' are read, and the results stored in 
% 't_constituents.mat' for future use.
%
% [...]=T_GETCONSTS(TIME) recomputes the frequencies from the 
% rates-of-change of astronomical parameters at the matlab TIME given.

% R. Pawlowicz 11/8/99
% Version 1.0


if exist('t_constituents.mat','file');
  load t_constituents
else

  nc=146;
  empvec=zeros(nc,1)+NaN;
  const=struct('name',setstr(zeros(nc,4)),... % constituent names
               'freq',empvec,...              % and frequencies (cph)
               'kmpr',setstr(zeros(nc,4)),... % names of comparisons
	       'ikmpr',empvec,'df',empvec,... % ..and their index (into .name)
	       'doodson',zeros(nc,6)+NaN,...  % doodson#s (when available)
	       'semi',empvec,...              % phase offsets
	       'isat',empvec,...              % index into "sat"
	       'nsat',empvec,...              % # of associated satellites in "sat"
	       'ishallow',empvec,...          % index in "shallow"
	       'nshallow',empvec,...          % # of generating freqs in "shallow"
	       'doodsonamp',empvec,...        % Equilibrium Amplitude (when available)
	       'doodsonspecies',empvec);      % Species
  nsat=162;
  sat=struct('deldood',zeros(nsat,3),...  % changes in last 3 doodson#s 
             'phcorr',zeros(nsat,1),...   % phase corrections
             'amprat',zeros(nsat,1),...   % amplitude corrections
	     'ilatfac',zeros(nsat,1),...  % latitude-depend