for size


%% 
% This method of randomly generating a symktensor is useful when setting 
% an initialization point in symmetric decomposition methods (i.e.
% |cp_sym|).
%%
% Lastly, a |symktensor| object can be declared from a vectorized 
% version of the factor matrix and lambda vector, in which the lambda
% vector is stacked on top of a vectorized version of the factor matrix.
% The shape of the tensor must also be specified, by either passing a
% tensor/symtensor or listing the number of modes and the ra