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root / _FullBNT / BNT / CPDs / @discrete_CPD / log_prob_node.m @ 8:b5b38998ef3b

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function L = log_prob_node(CPD, self_ev, pev)
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% LOG_PROB_NODE Compute sum_m log P(x(i,m)| x(pi_i,m), theta_i) for node i (discrete)
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% L = log_prob_node(CPD, self_ev, pev)
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%
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% self_ev(m) is the evidence on this node in case m.
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% pev(i,m) is the evidence on the i'th parent in case m (if there are any parents).
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% (These may also be cell arrays.)
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[P, p] = prob_node(CPD, self_ev, pev); % P may underflow, so we use p


    		
  

  

    
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tiny = exp(-700);


    		
  

  

    
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p = p + (p==0)*tiny; % replace 0s by tiny


    		
  

  

    
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L = sum(log(p));