e5f4633c39
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65 lines
1.5 KiB
Prolog
65 lines
1.5 KiB
Prolog
% Slim Abdennadher, Thom fruehwirth, LMU, July 1998
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% Straightforward Fourier Solver for linear inequations
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% may loop because of producing more and mor eredundant equations
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% compare to gauss.pl and fougau.pl
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:- use_module(library(chr)).
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:- ['math-utilities.pl']. % load auxiliary file
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:- use_module( library(lists), [member/2, memberchk/2,select/3]).
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handler gauss.
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option(check_guard_bindings, on). % for delete(X...)
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option(already_in_store, off).
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option(already_in_heads, off).
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operator(100,xfx,leq).
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constraints (leq)/2.
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redundant @
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[X*Coeff1|P1] leq C1 \ P leq C2 <=>
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delete(X*Coeff2,P,P2),
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is_div(Coeff2,Coeff1,C),
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C < 0,
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mult_const(eq0(C1,P1),C,eq0(C1C,P1C)),
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add_eq0(eq0(C2,P2),eq0(C1C,P1C),eq0(C3,P3)),
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P3=[], 0 >= C3
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true.
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propagate(X) @
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[X*Coeff1|P1] leq C1, P leq C2 ==>
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delete(X*Coeff2,P,P2),
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is_div(Coeff2,Coeff1,C),
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C > 0
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mult_const(eq0(C1,P1),C,eq0(C1C,P1C)),
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add_eq0(eq0(C2,P2),eq0(C1C,P1C),eq0(C3,P3)),
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P3 leq C3.
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zero @ [] leq C1 <=> 0 =< C1.
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constraints {}/1.
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% curly brackets as wrapper to avoid name clash with built-in =:= etc.
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split @ { C, Cs } <=> { C }, { Cs }.
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normalize @ {A >= B} <=> {B =< A}.
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normalize @ {A =:= B} <=> {A >= B}, {B =< A}.
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normalize @ {A =< B} <=>
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normalize(A,B,Poly,Const),
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Poly leq Const.
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/*
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3 * X + 2 * Y - 4 * (3 + Z) =:= 2 * (X - 3) + (Y + Z) * 7 ,
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2 * (X + Y + Z) =:= 3 * (X - Y - Z) ,
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5 * (X + Y) - 7 * X - Z =:= (2 + 1 + X) * 6.
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*/
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