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source: branches/f4grobner/term.lisp@ 2367

Last change on this file since 2367 was 2360, checked in by Marek Rychlik, 9 years ago

* empty log message *

File size: 3.1 KB
Line 
1;;; -*- Mode: Lisp -*-
2;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
3;;;
4;;; Copyright (C) 1999, 2002, 2009, 2015 Marek Rychlik <rychlik@u.arizona.edu>
5;;;
6;;; This program is free software; you can redistribute it and/or modify
7;;; it under the terms of the GNU General Public License as published by
8;;; the Free Software Foundation; either version 2 of the License, or
9;;; (at your option) any later version.
10;;;
11;;; This program is distributed in the hope that it will be useful,
12;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
13;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14;;; GNU General Public License for more details.
15;;;
16;;; You should have received a copy of the GNU General Public License
17;;; along with this program; if not, write to the Free Software
18;;; Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19;;;
20;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
21
22(defpackage "TERM"
23 (:use :cl :monom :ring)
24 (:export "TERM"
25 "TERM-EXPONENTS"
26 "TERM-MONOM"
27 "TERM-COEFF"
28 "MAKE-TERM"
29 "MAKE-TERM-VARIABLE"
30 "TERM-MUL"
31 "TERM-SUGAR"
32 "TERM-DEPENDS-P"
33 "TERM->CONS"))
34
35
36(in-package :term)
37
38(proclaim '(optimize (speed 3) (space 0) (safety 0) (debug 0)))
39
40(defclass term (monom)
41 ((coeff :initarg :coeff :accessor r-coeff))
42 (:default-initargs :dimension nil :exponents nil :coeff nil))
43
44(defmethod print-object ((self term) stream)
45 (format stream "#<TERM DIMENSION=~A EXPONENTS=~A COEFF=~A>"
46 (r-dimension self)
47 (r-exponents self)
48 (r-coeff self)))
49
50(defmethod shared-initialize ((self term) slot-names
51 &rest
52 initargs
53 &key
54 &allow-other-keys)
55 (format t "TERM::SHARED-INITIALIZE called with:~&SLOT-NAMES: ~W~&INITARGS: ~W.~%" slot-names initargs)
56 ;;(call-next-method)
57 )
58
59
60#|
61(defun make-term-variable (nvars pos
62 &optional
63 (power 1)
64 (coeff 1))
65 "Construct a term in the polynomial ring RING[X[0],X[1],X[2],...X[NVARS-1]]
66over the ring RING which represents a single variable. It assumes
67number of variables NVARS and the variable is at position
68POS. Optionally, the variable may appear raised to power POWER.
69Optionally, the term may appear with an arbitrary coefficient, which
70defaults to the unit of the RING."
71 (declare (type fixnum nvars pos))
72 (make-term :monom (make-monom-variable nvars pos power)
73 :coeff coeff))
74
75|#
76
77(defmethod r* ((term1 term) (term2 term))
78 "Returns the product of the terms TERM1 and TERM2,
79or NIL when the product is 0. This definition takes care of divisors of 0
80in the coefficient ring."
81 (format t "TERM::R* called with:~& TERM1: ~A~& TERM2: ~A~%" term1 term2)
82 (change-class (call-next-method) 'term))
83
84#|
85
86(defun term->cons (term)
87 "A human-readable representation of a term as a cons (MONOM . COEFF)."
88 (declare (type term term))
89 (cons (monom->list (term-monom term)) (term-coeff term)))
90
91|#
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