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diff --git a/sourcecodes/bnt-master/BNT/inference/dynamic/@frontier_inf_engine/marginal_nodes.m b/sourcecodes/bnt-master/BNT/inference/dynamic/@frontier_inf_engine/marginal_nodes.m
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+function marginal = marginal_nodes(engine, nodes, t)
+% MARGINAL_NODES Compute the marginal on the specified query nodes (frontier)
+% marginal = marginal_nodes(engine, nodes, t)
+%
+% 't' specifies the time slice of the earliest node in 'nodes'.
+% 'nodes' cannot span more than 2 time slices.
+%
+% Example:
+% Consider a DBN with 2 nodes per slice.
+% Then t=2, nodes=[1 3] refers to node 1 in slice 2 and node 1 in slice 3,
+% i.e., nodes 3 and 5 in the unrolled network,
+
+if nargin < 3, t = 1; end
+assert(length(nodes)==1);
+i = nodes(1);
+bigpot = engine.fwdback{i,t};
+bnet = bnet_from_engine(engine);
+ss  = length(bnet.intra);
+nodes = nodes + (t-1)*ss;
+%if t > 1, nodes = nodes + ss; end
+marginal = pot_to_marginal(marginalize_pot(bigpot, nodes));