MERGE_DICTIONARY - merges two cell arrays of chars and returns
only the distinct elements of their union (used by tmg.m,
tmg_query.m, tdm_update.m)
[ALL_WORDS, ALL_DOC_IDS]=MERGE_DICTIONARY(ALL_WORDS, NEW_WORDS,
ALL_DOC_IDS, NEW_DOC_IDS) returns in ALL_WORDS all distinct
elements of the union of the cell arrays of chars ALL_WORDS,
NEW_WORDS corresponding to two document collections. ALL_DOC_IDS
and NEW_DOC_IDS contain the inverted indices of the two
collections. Output argument ALL_DOC_IDS contains the inverted
index of the whole collection.
Copyright 2011 Dimitrios Zeimpekis, Eugenia Maria Kontopoulou,
Efstratios Gallopoulos