21 lines
747 B
Matlab
21 lines
747 B
Matlab
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function R = shortcut(Ab, frontals, separators)
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%SHORTCUT This is a simple scalar-level function for computing a "shortcut"
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%of frontals conditioned on separators. Note that the input matrix Ab is
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%assumed to have a RHS vector in its right-most column, thus this rightmost
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%column index should not be listed in either frontals or separators. This
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%function computes p(frontals | separators), marginalizing out all other
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%variables (cooresponding to columns) in Ab.
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% First marginalize out all others
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cols = 1:size(Ab,2)-1;
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toMarginalizeOut = setdiff(cols, [ frontals separators ]);
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[ cond marg ] = eliminate(Ab, toMarginalizeOut);
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% Now eliminate the frontals to get the conditional
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[ cond marg ] = eliminate(marg, frontals);
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R = cond;
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end
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