diogo/polynomialmani.pl
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Diogo Cordeiro 2018-11-23 00:09:07 +00:00
parent 0aafcc327f
commit 58f5a5562a
1 changed files with 26 additions and 26 deletions
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polimani.pl
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@ -14,12 +14,10 @@
* Hugo David Cordeiro Sales * Hugo David Cordeiro Sales
* up201704178@fc.up.pt * up201704178@fc.up.pt
* *
********************************************* *********************************************
* Follows 'Coding guidelines for Prolog' * * Follows 'Coding guidelines for Prolog' *
* https://doi.org/10.1017/S1471068411000391 * * https://doi.org/10.1017/S1471068411000391 *
********************************************* *********************************************/
*/
/* Import the Constraint Logic Programming over Finite Domains library /* Import the Constraint Logic Programming over Finite Domains library
* Essentially, this library improves the way Prolog deals with integers, * Essentially, this library improves the way Prolog deals with integers,
@ -33,10 +31,11 @@
/******************************* /*******************************
* USER INTERFACE * * USER INTERFACE *
*******************************/ *******************************/
/* /*
poly2list/2 transforms a list representing a polynomial (second poly2list/2 transforms a list representing a polynomial (second
argument) into a polynomial represented as an expression (first argu- argument) into a polynomial represented as an expression (first
ment) and vice-versa. argument) and vice-versa.
*/ */
poly2list(P, L) :- poly2list(P, L) :-
polynomial_to_list(P, L). polynomial_to_list(P, L).
@ -100,12 +99,12 @@ polynomial_variable(X) :-
% Returns true if X is a power term, false otherwise. % Returns true if X is a power term, false otherwise.
% %
power(P^N) :- power(P^N) :-
( (
zcompare((<), 0, N), zcompare((<), 0, N),
polynomial_variable(P) polynomial_variable(P)
; ;
fail fail
). ).
power(X) :- power(X) :-
polynomial_variable(X). polynomial_variable(X).
%% Tests: %% Tests:
@ -136,13 +135,13 @@ power(X) :-
% %
term(N) :- term(N) :-
number(N). number(N).
%% N in inf..sup. %% N in inf..sup.
term(X) :- term(X) :-
power(X). power(X).
term(L * R) :- term(L * R) :-
term(L), term(L),
term(R). term(R).
%% append_two_atoms_with_star(L, R, T). %% append_two_atoms_with_star(L, R, T).
%% Tests: %% Tests:
%% ?- term(2*x^3). %% ?- term(2*x^3).
%@ true . %@ true .
@ -271,19 +270,20 @@ term_to_list(P, [P2]) :-
simplify_term(Term_In, Term_Out) :- simplify_term(Term_In, Term_Out) :-
term_to_list(Term_In, L), term_to_list(Term_In, L),
sort(0, @=<, L, L2), sort(0, @=<, L, L2),
( (
member(0, L2), member(0, L2),
Term_Out = 0 Term_Out = 0
; ;
( (
length(L2, 1), length(L2, 1),
Term_Out = Term_In Term_Out = Term_In
); ;
exclude(==(1), L2, L3), exclude(==(1), L2, L3),
join_similar_parts_of_term(L3, L4), join_similar_parts_of_term(L3, L4),
sort(0, @>=, L4, L5), sort(0, @>=, L4, L5),
term_to_list(Term_Out, L5) term_to_list(Term_Out, L5)
), )
),
% First result is always the most simplified form. % First result is always the most simplified form.
!. !.
%% Tests: %% Tests: