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: plus.m
    path of file: ./repos/scGEAToolbox/tensor_toolbox/@ktensor
    
    the code of the file until where you have to start completion: function C = plus(A, B)

    
function C = plus(A, B)
%PLUS Binary addition for ktensor.
%
%   C = PLUS(A,B) adds two ktensors of the same size, and the
%   result is a ktensor of the same size.
%
%   See also KTENSOR.
%
%Tensor Toolbox for MATLAB: <a href="https://www.tensortoolbox.org">www.tensortoolbox.org</a>


if isa(B, 'sumtensor') %If the 2nd argument is a sumtensor
    C = plus(B, A); %Call plus for sumtensor
        return
    end