Cannot CD to (name is nonexistent or not a directory)

I am getting this error at cd(folder).

thisFile = mfilename('C:\Users\user\Documents\mu\see');

[folder,name] = fileparts(thisFile);

cd(folder)

addpath('\do');

Answer 1

[Walter Roberson]

create_missing = false;

parts = {'C:\', 'Users', 'user', 'Documents', 'mu'};
if ~exist(parts{1}, 'dir')
    error('You do not have a C: drive. Giving up.');
end
failed = false;
for K = 2 : length(parts)
    thispath = fullfile(parts{1:K});
    if exist(thispath, 'dir')
        fprintf('Okay we already have directory %s\n', thispath);
    elseif create_missing
        try
            mkdir(thispath);
            fprintf('Was able to create missing directory %s\n', thispath);
        catch
            fprintf('Failed trying to create missing directory %s', thispath);
            oldpath = fullfile(parts{1:K-1});
            p = fileattrib(oldpath);
            fprintf('Attributes of parent directory %s are:\n', oldpath);
            disp(p);
            failed = true;
            break
        end
    else
      fprintf('Directory %s does not exist and you asked that missing directories not be created. Set the variable create_missing to true if you want the directory created\n', thispath);
      failed = true;
      break
    end
end
if failed
    fprintf('Some directory not created. Not ready to use\n');
else
    fprintf('Okay, should be ready to use directory %s\n', fullfile(parts{:}) );
end

Answer 2

[Image Analyst]

That folder does not exist. Just because you typed it in does not mean it will exist. Call the mkdir() function to create it, but chances are you should not be using cd anyway, but creating full filenames with the fullfile() function instead. See the FAQ: http://matlab.wikia.com/wiki/FAQ#Where_did_my_file_go.3F_The_risks_of_using_the_cd_function.