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. 2013 Mar 18;8(3):e58960. doi: 10.1371/journal.pone.0058960

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© 2013 Beuls, Steels

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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A feature matrix has rows for the different attributes (, , ) and columns for the possible values of these attributes () which could correspond for example to , and for the attribute . The cells contain + when the relevant attribute value pair is true, - when it is not, and ? when it is open. Two feature matrices are compared using the standard logical unification operator to see whether they fit. Open values may thus be determined. For example, the open values for in the feature matrix of fracksup become constrained by those specified for the marker -tjikaboem and conversely the gender values of the marker become constrained by the word.

Inline graphic — A feature matrix has rows for the different attributes (, , ) and columns for the possible values of these attributes () which could correspond for example to , and for the attribute . The cells contain + when the relevant attribute value pair is true, - when it is not, and ? when it is open. Two feature matrices are compared using the standard logical unification operator to see whether they fit. Open values may thus be determined. For example, the open values for in the feature matrix of fracksup become constrained by those specified for the marker -tjikaboem and conversely the gender values of the marker become constrained by the word.