annotate toolboxes/FullBNT-1.0.7/bnt/general/shrink_obs_dims_in_table.m @ 0:e9a9cd732c1e
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first hg version after svn
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wolffd |
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Tue, 10 Feb 2015 15:05:51 +0000 |
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1 function T2 = shrink_obs_dims_in_table(T1, dom, evidence)
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2 % SHRINK_OBS_DIMS_IN_TABLE Set observed dimensions to size 1
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3 % T2 = shrink_obs_dims_in_table(T1, dom, evidence)
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4 %
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5 % If 'T1' contains observed nodes, it will have 0s in the positions that are
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6 % inconsistent with the evidence. We now remove these 0s and set the corresponding dimensions to
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7 % size 1, to be consistent with the way most inference engines handle evidence, which is to
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8 % shrink observed nodes before doing inference.
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9
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10 % This is used by pearl and enumerative inf. engines.
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11
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12 odom = dom(~isemptycell(evidence(dom)));
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13 vals = cat(1,evidence{odom});
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14 ndx = mk_multi_index(length(dom), find_equiv_posns(odom, dom), vals(:));
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15 T2 = T1(ndx{:});
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