time   calls  line
                  1 function oldpath = addpath(varargin)
                  2 %ADDPATH Add directory to search path.
                  3 %   ADDPATH DIRNAME prepends the specified directory to the current
                  4 %   matlabpath.  Surround the DIRNAME in quotes if the name contains a
                  5 %   space.  If DIRNAME is a set of multiple directories separated by path
                  6 %   separators, then each of the specified directories will be added.
                  7 %
                  8 %   ADDPATH DIR1 DIR2 DIR3 ...  prepends all the specified directories to
                  9 %   the path.
                 10 %
                 11 %   ADDPATH ... -END    appends the specified directories.
                 12 %   ADDPATH ... -BEGIN  prepends the specified directories.
                 13 %   ADDPATH ... -FROZEN disables directory change detection for directories
                 14 %                       being added and thereby conserves Windows change
                 15 %                       notification resources (Windows only).
                 16 %
                 17 %   Use the functional form of ADDPATH, such as ADDPATH('dir1','dir2',...),
                 18 %   when the directory specification is stored in a string.
                 19 %
                 20 %   P = ADDPATH(...) returns the path prior to adding the specified paths.
                 21 %
                 22 %   Examples
                 23 %       addpath c:\matlab\work
                 24 %       addpath /home/user/matlab
                 25 %       addpath /home/user/matlab:/home/user/matlab/test:
                 26 %       addpath /home/user/matlab /home/user/matlab/test
                 27 %
                 28 %   See also RMPATH, PATHTOOL, PATH, SAVEPATH, USERPATH, GENPATH, REHASH.
                 29 
                 30 %   Copyright 1984-2007 The MathWorks, Inc.
                 31 %   $Revision: 1.29.4.11 $  $Date: 2007/12/06 13:29:45 $
                 32 
                 33 % Number of  input arguments
             1   34 n = nargin; 
             1   35 error(nargchk(1,Inf,n,'struct')); 
                 36 
             1   37 if nargout>0 
                 38     oldpath = path;
                 39 end
                 40 
             1   41 append = -1; 
             1   42 freeze = 0; 
             1   43 args = varargin; 
                 44 
             1   45 while (n > 1)    
                 46     last = args{n};
                 47     % Append or prepend to the existing path
                 48     if isequal(last,1) || strcmpi(last,'-end')
                 49         if (append < 0), append = 1; end; 
                 50         n = n - 1;
                 51     elseif isequal(last,0) || strcmpi(last,'-begin')
                 52         if (append < 0), append = 0; end;
                 53         n = n - 1;
                 54     elseif strcmpi(last,'-frozen') 
                 55         if ispc, freeze = 1; end
                 56         n = n - 1;
                 57     else
                 58         break;
                 59     end
                 60 end
             1   61 if (append < 0), append = 0; end 
                 62 
                 63 % Check, trim, and concatenate the input strings
             1   64 p = catdirs(varargin{1:n}); 
                 65 
                 66 % If p is empty then return
             1   67 if isempty(p) 
                 68     return;
                 69 end
                 70 
                 71 % See whether frozen is desired, where the state is not already set frozen
             1   72 if freeze 
                 73     oldfreeze = system_dependent('DirsAddedFreeze');
                 74     % Check whether old unfrozen state needs to be restored
                 75     if ~isempty(strfind(oldfreeze,'unfrozen'))
                 76         %Use the onCleanup object to automatically restore old state at
                 77         %exit or error.
                 78         cleanUp = onCleanup(@()system_dependent('DirsAddedUnfreeze')); %#ok<NASGU>
                 79     end
                 80 end
                 81 
                 82 % Append or prepend the new path
             1   83 mp = matlabpath; 
             1   84 if append 
                 85     path(mp, p);
             1   86 else 
  0.03       1   87     path(p, mp); 
             1   88 end     

Other subfunctions in this file are not included in this listing.