501 lines
		
	
	
		
			16 KiB
		
	
	
	
		
			Prolog
		
	
	
	
	
	
			
		
		
	
	
			501 lines
		
	
	
		
			16 KiB
		
	
	
	
		
			Prolog
		
	
	
	
	
	
%%% -*- Mode: Prolog; -*-
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%
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%  $Date: 2011-11-28 14:41:26 +0100 (Mon, 28 Nov 2011) $
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%  $Revision: 6764 $
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%
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%  This file is part of ProbLog
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%  http://dtai.cs.kuleuven.be/problog
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%
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%  ProbLog was developed at Katholieke Universiteit Leuven
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%                                                            
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%  Copyright 2008, 2009, 2010
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%  Katholieke Universiteit Leuven
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%                                                              
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%  Main authors of this file:
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%  Bernd Gutmann
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%
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%
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% Artistic License 2.0
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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:- module(intervals, [intervals_merge/3,
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		      intervals_disjoin/3,
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		      intervals_disjoin/4,
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		      intervals_partition/2,
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		      intervals_encode/2]).
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:- style_check(all).
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:- yap_flag(unknown,error).
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:- use_module(library(lists), [member/2, reverse/2, select/3]).
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%  intervals_merge(+Interval1,+Interval2,-ResultingInterval)
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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intervals_merge(all,X,X).
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intervals_merge(none,_,none).
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intervals_merge(above(X),Other,Result) :-
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	number(X),
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	intervals_merge_above(Other,X,Result).
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intervals_merge(below(X),Other,Result) :-
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	number(X),
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	intervals_merge_below(Other,X,Result).
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intervals_merge(interval(X1,X2),Other,Result) :-
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	number(X1),
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	number(X2),
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	intervals_merge_interval(Other,X1,X2,Result).
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intervals_merge_above(all,X,above(X)).
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intervals_merge_above(none,_,none).
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intervals_merge_above(above(Y),X,above(Z)) :-
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	number(Y),
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	Z is max(X,Y).
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intervals_merge_above(below(Y),X,Result) :-
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	number(Y),
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	(
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	 X=<Y
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	->
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	 Result=interval(X,Y);
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	 Result=none
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	).
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intervals_merge_above(interval(Y1,Y2),X,Result):-
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	number(Y1),
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	number(Y2),
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	(
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	 X=<Y1
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	->
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	 Result=interval(Y1,Y2);
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	 (
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	  X=<Y2
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	 ->
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	  Result=interval(X,Y2);
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	  Result=none
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	 )
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	).
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intervals_merge_below(all,X,below(X)).
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intervals_merge_below(none,_,none).
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intervals_merge_below(above(Y),X,Result) :-
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	number(Y),
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	(
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	 Y=<X
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	->
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	 Result=interval(Y,X);
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	 Result=none
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	).
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intervals_merge_below(below(Y),X,below(Z)) :-
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	number(Y),
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	Z is min(X,Y).
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intervals_merge_below(interval(Y1,Y2),X,Result) :-
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	number(Y1),
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	number(Y2),
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	(
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	 X>=Y2
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	->
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	 Result=interval(Y1,Y2);
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	 (
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	  X>=Y1
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	 ->
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	  Result=interval(Y1,X);
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	  Result=none
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	 )
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	).
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intervals_merge_interval(all,X1,X2,interval(X1,X2)).
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intervals_merge_interval(none,_,_,none).
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intervals_merge_interval(above(X),Y1,Y2,Result) :-
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	number(X),
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	intervals_merge_above(interval(Y1,Y2),X,Result).
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intervals_merge_interval(below(X),Y1,Y2,Result) :-
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	number(X),
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	intervals_merge_below(interval(Y1,Y2),X,Result).
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intervals_merge_interval(interval(X1,X2),Y1,Y2,Result) :-
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	number(X1),
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	number(X2),
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	(
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	    X1<Y1
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	->
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	    intervals_merge_interval_intern(X1,X2,Y1,Y2,Result);
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	    intervals_merge_interval_intern(Y1,Y2,X1,X2,Result)
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	).
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intervals_merge_interval_intern(_X1,X2,Y1,Y2,Result) :-
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	(
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	 Y1=<X2
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	->
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	 (
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	  Y2=<X2
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	 ->
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	  Result=interval(Y1,Y2);
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	  Result=interval(Y1,X2)
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	 );
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	 Result=none
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	).
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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% 
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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select_all([],List,List).
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select_all([H|T],List,Remainder) :-
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	once(select(H,List,TMP)),
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	select_all(T,TMP,Remainder).
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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% 
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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intervals_disjoin(X,P,In,Out) :-
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	disjoin_intern(X,P,In),
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	select_all(In,P,Out).
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intervals_disjoin(X,P,In) :-
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	disjoin_intern(X,P,In).
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disjoin_intern(below(X),P,In) :-
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	findall((interval(A,B),Tail),(member((interval(A,B),Tail),P),B=<X),Tmp),
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	(
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	 (member((below(Y),Tail),P),Y=<X)
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	->
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	 In=[(below(Y),Tail)|Tmp];
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	 In=Tmp
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	).
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disjoin_intern(above(X),P,In) :-
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	findall((interval(A,B),Tail),(member((interval(A,B),Tail),P),A>=X),Tmp),
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	(
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	 (member((above(Y),Tail),P),Y>=X)
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	->
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	 In=[(above(Y),Tail)|Tmp];
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	 In=Tmp
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	).
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disjoin_intern(interval(X,Y),P,In) :-
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	findall((interval(A,B),Tail),(member((interval(A,B),Tail),P),A>=X,B=<Y),In).
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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% partitions a list of intervals into disjoined intervals
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% together with their prefix
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%
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%
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% ?- intervals_partition([below(10),above(5)],X).
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%    X = [(below(5.0),[]),
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%         (interval(5.0,10.0),[below(5.0)]),
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%         (above(10.0),[interval(5.0,10.0),below(5.0)])]   
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%
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%
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% intervals_partition(+List,-List)
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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intervals_partition([],[]).
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intervals_partition([X|T],[(below(A), [])|T2]) :-
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	once(extract_points([X|T],[],[A|PT])),
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	to_interval(PT,A,[below(A)],T2).
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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% extracts from list of intervals all relevant constants
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%
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%    ?- intervals:extract_points([below(10),above(5)],[],L).
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%        L = [5.0,10.0] ?
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%
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% extract_points(+List, +List, -List)
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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extract_points([],X,Y) :-
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	sort(X,Y).
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extract_points([below(A)|T],X,Y) :-
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	A2 is float(A),
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	extract_points(T,[A2|X],Y).
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extract_points([above(A)|T],X,Y) :-
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	A2 is float(A),
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	extract_points(T,[A2|X],Y).
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extract_points([interval(A,B)|T],X,Y) :-
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	A2 is float(A),
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	B2 is float(B),
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	extract_points(T,[A2,B2|X],Y).
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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% transforms a sorted list of constants into a list of
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% intervals together with their prefixes
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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to_interval([],A,Tail,[(above(A),Tail)]).
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to_interval([B|T],A,Tail,[(interval(A,B),Tail)|T2]) :-
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	to_interval(T,B,[interval(A,B)|Tail],T2).
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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% encodes an interval as an atom
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%
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% ?- intervals_encode(below(42),X).
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%    X = lm1000h42
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% ?- intervals_encode(above(23),X).
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%    X = l23h1000
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% ?- intervals_encode(interval(-2.3,4.2),X).
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%    X = lm2d3h4d2 ? 
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%
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% intervals_encode(+Interval,-Atom)
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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intervals_encode(below(X),Atom) :-
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	(
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	 X < -1000
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	->
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	 X2 is 2*X;
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	 X2 is -1000
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	),
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	intervals_encode(interval(X2,X),Atom).
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intervals_encode(above(X),Atom) :-
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	(
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	 X > 1000
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	->
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	 X2 is 2*X;
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	 X2 is 1000
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	),
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	intervals_encode(interval(X,X2),Atom).
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intervals_encode(interval(Low,High),Atom) :-
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	once(my_number_atom(Low,LowA)),
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	once(my_number_atom(High,HighA)),
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	atomic_concat([l,LowA,h,HighA],Atom).
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my_number_atom(Number,Atom) :-
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	% make float
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	NumberF is Number+0.0,
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	number_codes(NumberF,XC),
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	reverse(XC,A),
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	remove_prefix_zeros(A,B),
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	remove_prefix_dot(B,C),
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	fix_special_cases(C,D),
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	reverse(D,DC),
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	replace_special_characters(DC,DC_Final),
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	atom_codes(Atom,DC_Final).
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remove_prefix_zeros([],[]).
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remove_prefix_zeros([X|T],Result) :-
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	(
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	 X==48  % 48 = '0'
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	->
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	 remove_prefix_zeros(T,Result);
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	 Result=[X|T]
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	).
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remove_prefix_dot([],[]).
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remove_prefix_dot([X|T],Result) :-
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	(
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	 X==46  % 46 = '.'
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	->
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	 Result=T;
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	 Result=[X|T]
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	).
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fix_special_cases([],[48]).
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fix_special_cases([H|T],Result) :-
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	(
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	 [H|T] == [48,45]     % ='0-'
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	->
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	 Result=[48];
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	 Result=[H|T]
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	).
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replace_special_characters([],[]).
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replace_special_characters([H|T],[H2|T2]) :-
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	(
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	 H==45   % '-'
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	->
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	 H2=109;		% 'm'
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	 (
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	  H==46
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	 ->
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	  H2=100;		% 'd'
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	  H2=H
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	 )
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	),
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	replace_special_characters(T,T2).
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