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function cs = children(adj_mat, i, t)
% CHILDREN Return the indices of a node's children in sorted order
% c = children(adj_mat, i, t)
%
% t is an optional argument: if present, dag is assumed to be a 2-slice DBN
if nargin < 3
cs = find(adj_mat(i,:));
else
if t==1
cs = find(adj_mat(i,:));
else
ss = length(adj_mat)/2;
j = i+ss;
cs = find(adj_mat(j,:)) + (t-2)*ss;
end
end
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