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Diffstat (limited to 'viterbi_generator/tests/utils/make_next.m')
| -rw-r--r-- | viterbi_generator/tests/utils/make_next.m | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/viterbi_generator/tests/utils/make_next.m b/viterbi_generator/tests/utils/make_next.m new file mode 100644 index 0000000..f5af8dc --- /dev/null +++ b/viterbi_generator/tests/utils/make_next.m @@ -0,0 +1,54 @@ +function [ NEXT ] = make_next(SYMBOLS) +% +% MAKE_NEXT: +% This function returns a lookuptable containing a mapping +% between the present state and the legal next states. +% Each row correspond to a state, and the two legal states +% related to state n is located in NEXT(n,1) and in +% NEXT(n,2). States are represented by their related +% numbers. +% +% SYNTAX: [ NEXT ] = make_next(SYMBOLS) +% +% INPUT: SYMBOLS: The table of symbols corresponding the the state- +% numbers. +% +% OUTPUT: NEXT: The transition table describing the legal next +% states asdescribed above. +% +% SUB_FUNC: None +% +% WARNINGS: None +% +% TEST(S): The function has been verified to return the expected +% results. +% +% AUTOR: Jan H. Mikkelsen / Arne Norre Ekstrøm +% EMAIL: hmi@kom.auc.dk / aneks@kom.auc.dk +% +% $Id: make_next.m,v 1.3 1997/09/22 08:13:29 aneks Exp $ + +% FIRST WE NEED TO FIND THE NUMBER OF LOOPS WE SHOULD RUN. +% THIS EQUALS THE NUMBER OF SYMBOLS. ALSO MAXSUM IS NEEDED FOR +% LATER OPERATIONS. +% +[ states , maxsum ]=size(SYMBOLS); + +search_matrix=SYMBOLS(:,2:maxsum); +maxsum=maxsum-1; + +% LOOP OVER THE SYMBOLS. +% +for this_state=1:states, + search_vector=SYMBOLS(this_state,1:maxsum); + k=0; + for search=1:states, + if (sum(search_matrix(search,:)==search_vector)==maxsum) + k=k+1; + NEXT(this_state,k)=search; + if k > 2, + error('Error: identified too many next states'); + end + end + end +end
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