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/IRtools/Extra/prblur_tools/@kronMatrix
    
    the code of the file until where you have to start completion: function n = plus(k,m)
%  kronMatrix +
%
%     returns the sum of two kronMatrix objects.
%
%     n = k + m will result in a kronMatrix object if
%        k.a == m.a or k.b == m.b
%
%     otherwise, this function will return an explicitly
%        formed matrix, i.e. kron(k) + kron(m)

    
function n = plus(k,m)
%  kronMatrix +
%
%     returns the sum of two kronMatrix objects.
%
%     n = k + m will result in a kronMatrix object if
%        k.a == m.a or k.b == m.b
%
%     otherwise, this function will return an explicitly
%        formed matrix, i.e. kron(k) + kron(m)
%

if (isa(k, 'kronMatrix'))
   if (isa(m, 'kronMatrix'))
      if isequal(k.a, m.a)
         eval('n = kronMatrix(k.a, k.b + m.b);', ...
              'error(lasterr)')
      elseif isequal(k.b, m.b)
         eval('n = kronMatrix(k.a + m.a, k.b);', ...
              'error(lasterr)')
      else
         eval ('n = kron(k) + kron(m);', ...
               'error(lasterr)')
      end