function CPD = tabular_chance_node(sz, CPT)% TABULAR_CHANCE_NODE Like tabular_CPD, but simplified% CPD = tabular_chance_node(sz, CPT)%% sz(1:end-1) is the sizes of the parents, sz(end) is the size of this node% By default, CPT is a random stochastic matrix.if nargin==0  % This occurs if we are trying to load an object from a file.  CPD = init_fields;  CPD = class(CPD, 'tabular_chance_node');  return;elseif isa(sz, 'tabular_chance_node')  % This might occur if we are copying an object.  CPD = sz;  return;endCPD = init_fields;if nargin < 2,  CPT = mk_stochastic(myones(sz)); else  CPT = myreshape(CPT, sz);endCPD.CPT = CPT;CPD.size = sz;CPD = class(CPD, 'tabular_chance_node');%%%%%%%%%%%function CPD = init_fields()% This ensures we define the fields in the same order % no matter whether we load an object from a file,% or create it from scratch. (Matlab requires this.)CPD.CPT = [];CPD.size = [];