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yap-6.3/CLPQR/clpr/arith_r.pl

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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% clp(q,r) version 1.3.3 %
% %
% (c) Copyright 1992,1993,1994,1995 %
% Austrian Research Institute for Artificial Intelligence (OFAI) %
% Schottengasse 3 %
% A-1010 Vienna, Austria %
% %
% File: arith_r.pl %
% Author: Christian Holzbaur christian@ai.univie.ac.at %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
:- module( arith_r,
[
arith_eps/1,
arith_normalize/2,
integerp/1,
integerp/2
]).
%
% Modules receiving R expansion
%
arith_module( clpr).
arith_module( nfr).
:- multifile
user:goal_expansion/3.
:- dynamic
user:goal_expansion/3.
%
user:goal_expansion(arith_eval(Term,Res), Module, Expansion) :-
arith_module( Module),
compile_R( Term, Res, Code),
l2conj( Code, Expansion).
user:goal_expansion(arith_eval(Rel), Module, Expansion) :-
arith_module( Module),
compile_R( Rel, boolean, Code),
l2conj( Code, Expansion).
user:goal_expansion(case_signum(Term,Lt,Z,Gt), Module, Expansion) :-
arith_module( Module),
compile_case_signum_R( Term, Lt,Z,Gt, Code),
l2conj( Code, Expansion).
:- ensure_loaded( arith).
%
% This the only place where this constant lives
%
arith_eps( 1.0e-10). % for Monash #zero expansion 1.0e-12
eps( 1.0e-10, -1.0e-10).
arith_normalize( X, Norm) :- var(X), !,
raise_exception( instantiation_error(arith_normalize(X,Norm),1)).
arith_normalize( rat(N,D), Norm) :- rat_float( N,D, Norm).
arith_normalize( X, Norm) :- number(X),
Norm is float(X).
integerp( X) :-
floor(/*float?*/X)=:=X.
integerp( X, I) :-
floor(/*float?*/X)=:=X,
I is integer(X).