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: binind2latlon.m
    path of file: ./repos/CDT/cdt
    
    the code of the file until where you have to start completion: function [lat,lon] = binind2latlon(binind,varargin) 
% binind2latlon converts binned index values of a sinusoidal grid to geocoordinates. 
% 
% More information on the sinusoidal grid here: https://oceancolor.gsfc.nasa.gov/docs/format/l3bins/
%% Syntax
% 
%  [lat,lon] = binind2latlon(binind) 
%  [lat,lon] = binind2latlon(...,'rows',NumberOfRows) 
% 
%% Description 
% 
% [lat,lon] = binind2latlon(binind) gives the geo coordinates for the bin indices binind. 
% 
% [lat,lon] = binind2latlon(...,'rows',NumberOfRows) specifies the number of rows in the 
% grid. By default, binind2latlon will try to figure out the number of rows automatically, 
% but there's no guarantee it'll work. If you know the number of rows, specify them just
% to be sure. Common numbers of rows are as follows: 
% 
% * 180 rows for 1 a degree grid
% * 2160 rows for 5 minute grid
% * 4320 rows for a 1.5 minute grid
% 
%% Examples
% For examples type this into your Command Window: 
% 
%   showdemo binind2latlon_documentation
% 
%% Author Info 
% This function was written by Chad A. Greene of the University of Texas at Austin. 
% September 11, 2017. 


    
function [lat,lon] = binind2latlon(binind,varargin) 
% binind2latlon converts binned index values of a sinusoidal grid to geocoordinates. 
% 
% More information on the sinusoidal grid here: https://oceancolor.gsfc.nasa.gov/docs/format/l3bins/
%% Syntax
% 
%  [lat,lon] = binind2latlon(binind) 
%  [lat,lon] = binind2latlon(...,'rows',NumberOfRows) 
% 
%% Description 
% 
% [lat,lon] = binind2latlon(binind) gives the geo coordinates for the bin indices binind. 
% 
% [lat,lon] = binind2latlon(...,'rows',NumberOfRows) specifies the number of rows in the 
% grid. By default, binind2latlon will try to figure out the number of rows automatically, 
% but there's no guarantee it'll work. If you know the number of rows, specify them just
% to be sure. Common numbers of rows are as follows: 
% 
% * 180 rows for 1 a degree grid
% * 2160 rows for 5 minute grid
% * 4320 rows for a 1.5 minute grid
% 
%% Examples
% For examples type this into your Command Window: 
% 
%   showdemo binind2latlon_documentation
% 
%% Author Info 
% This function was written by Chad A. Greene of the University of Texas at Austin. 
% September 11, 2017. 

%% Input checks

narginchk(1,3) 
nargoutchk(2,2) 

%% Determine number of rows in sinusoidal grid:

% Start by assuming a a value based on maximum bin index: 

maxbin = max(binind); 

% One degree grid (111 km): 
if maxbin<50e3
   N = 180; 
end