You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: enter_evidence.m
    path of file: ./repos/bnt/BNT/inference/static/@var_elim_inf_engine
    
    the code of the file until where you have to start completion: function [engine, loglik] = enter_evidence(engine, evidence, varargin)
% ENTER_EVIDENCE Add the specified evidence to the network (var_elim)
% [engine, loglik] = enter_evidence(engine, evidence, ...)
%
% evidence{i} = [] if if X(i) is hidden, and otherwise contains its observed value (scalar or column vector)

% we could pre-process the evidence here, to prevent repeated work, but we don't.

    
function [engine, loglik] = enter_evidence(engine, evidence, varargin)
% ENTER_EVIDENCE Add the specified evidence to the network (var_elim)
% [engine, loglik] = enter_evidence(engine, evidence, ...)
%
% evidence{i} = [] if if X(i) is hidden, and otherwise contains its observed value (scalar or column vector)

% we could pre-process the evidence here, to prevent repeated work, but we don't.
engine.evidence = evidence;

if nargout == 2
  [m, loglik] = marginal_nodes(engine, [1]);
end