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: ttv.m
    path of file: ./repos/encode/external/tensor_toolbox_2.5/@ttensor
    
    the code of the file until where you have to start completion: function c = ttv(a,v,dims)
%TTV Tensor times vector for ttensor.
%
%   Y = TTV(X,A,N) computes the product of ttensor X with a

    
function c = ttv(a,v,dims)
%TTV Tensor times vector for ttensor.
%
%   Y = TTV(X,A,N) computes the product of ttensor X with a
%   (column) vector A.  The integer N specifies the dimension in X
%   along which A is multiplied.  If size(A) = [I,1], then X must have
%   size(X,N) = I.  Note that ndims(Y) = ndims(X) - 1 because the N-th
%   dimension is removed.
%
%   Y = TTV(X,{A1,A2,...}) computes the product of ttensor X with a
%   sequence of vectors in the cell array.  The products are computed
%   sequentially along all dimensions (or modes) of X. The cell array
%   contains ndims(X) vectors.
%
%   Y = TTV(X,{A1,A2,...},DIMS) computes the sequence tensor-vector
%   products along the dimensions specified by DIMS.
%
%   See also TENSOR/TTV, TTENSOR, TTENSOR/TTM.
%
%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: ttv.m,v 1.6 2010/03/19 23:46:31 tgkolda Exp $


%%%%%%%%%%%%%%%%%%%%%%
%%% ERROR CHECKING %%%
%%%%%%%%%%%%%%%%%%%%%%

% Check the number of arguments
if (nargin < 2)
    error('TTV requires at least two arguments.');
end