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: subsref.m
    path of file: ./repos/mtt/libs/tensor_toolbox_2.5/@ttensor
    
    the code of the file until where you have to start completion: function a = subsref(t,s)
%SUBSREF Subscripted reference for a ttensor.
%
%   Examples
%   core = tensor(rand(2,2,2));
%   X = TTENSOR(core, rand{4,2), rand(5,2),rand(3,2));
%   X.core %<-- returns core array
%   X.U %<-- returns a cell array of three matrices
%   X.U{1} %<-- returns the matrix corresponding to the first mode.
%
%   See also TTENSOR.
%
%MATLAB Tensor Toolbox.
%Copyright 2010, Sandia Corporation. 

% This is the MATLAB Tensor Toolbox by Brett Bader and Tamara Kolda. 
% http://csmr.ca.sandia.gov/~tgkolda/TensorToolbox.
% Copyright (2010) Sandia Corporation. Under the terms of Contract
% DE-AC04-94AL85000, there is a non-exclusive license for use of this
% work by or on behalf of the U.S. Government. Export of this data may
% require a license from the United States Government.
% The full license terms can be found in tensor_toolbox/LICENSE.txt
% $Id: subsref.m,v 1.10 2010/03/19 23:46:31 tgkolda Exp $

switch s(1).type    
    case '.'
        switch s(1).subs
            case {'core','lambda'}
                a = tt_subsubsref(t.core,s);

    
function a = subsref(t,s)
%SUBSREF Subscripted reference for a ttensor.
%
%   Examples
%   core = tensor(rand(2,2,2));
%   X = TTENSOR(core, rand{4,2), rand(5,2),rand(3,2));
%   X.core %<-- returns core array
%   X.U %<-- returns a cell array of three matrices
%   X.U{1} %<-- returns the matrix corresponding to the first mode.
%
%   See also TTENSOR.
%
%MATLAB Tensor Toolbox.
%Copyright 2010, Sandia Corporation. 

% This is the MATLAB Tensor Toolbox by Brett Bader and Tamara Kolda. 
% http://csmr.ca.sandia.gov/~tgkolda/TensorToolbox.
% Copyright (2010) Sandia Corporation. Under the terms of Contract
% DE-AC04-94AL85000, there is a non-exclusive license for use of this
% work by or on behalf of the U.S. Government. Export of this data may
% require a license from the United States Government.
% The full license terms can be found in tensor_toolbox/LICENSE.txt
% $Id: subsref.m,v 1.10 2010/03/19 23:46:31 tgkolda Exp $

switch s(1).type    
    case '.'
        switch s(1).subs
            case {'core','lambda'}
                a = tt_subsubsref(t.core,s);
            case {'U','u'}
                a = tt_subsubsref(t.u,s);
            otherwise
                error(['No such field: ', s.subs]);
        end