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function CPD = tabular_utility_node(bnet, node, T)
% TABULAR_UTILITY_NODE Represent a utility function as a table
% CPD = tabular_utility_node(bnet, node, T)
%
% node is the number of a node in this equivalence class.
% T is an optional argument (same shape as the CPT in tabular_CPD, but missing the last (child)
% dimension). By default, entries in T are chosen u.a.r. from 0:1 (using 'rand').
if nargin==0
% This occurs if we are trying to load an object from a file.
CPD = init_fields;
clamp = 0;
CPD = class(CPD, 'tabular_utility_node');
return;
elseif isa(bnet, 'tabular_utility_node')
% This might occur if we are copying an object.
CPD = bnet;
return;
end
CPD = init_fields;
ns = bnet.node_sizes;
ps = parents(bnet.dag, node);
sz = ns(ps);
if nargin < 3
T = myrand(sz);
else
T = myreshape(T, sz);
end
CPD.T = T;
CPD.sizes = sz;
CPD = class(CPD, 'tabular_utility_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.T = [];
CPD.sizes = [];
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