| 1 | ;;; -*- Mode: Lisp; Package: Maxima; Syntax: Common-Lisp; Base: 10 -*-
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| 2 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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| 3 | ;;;
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| 4 | ;;; Copyright (C) 1999, 2002, 2009, 2015 Marek Rychlik <rychlik@u.arizona.edu>
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| 5 | ;;;
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| 6 | ;;; This program is free software; you can redistribute it and/or modify
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| 7 | ;;; it under the terms of the GNU General Public License as published by
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| 8 | ;;; the Free Software Foundation; either version 2 of the License, or
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| 9 | ;;; (at your option) any later version.
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| 10 | ;;;
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| 11 | ;;; This program is distributed in the hope that it will be useful,
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| 12 | ;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 13 | ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 14 | ;;; GNU General Public License for more details.
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| 15 | ;;;
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| 16 | ;;; You should have received a copy of the GNU General Public License
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| 17 | ;;; along with this program; if not, write to the Free Software
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| 18 | ;;; Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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| 19 | ;;;
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| 20 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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| 21 |
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| 22 | (in-package :ngrobner)
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| 23 |
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| 24 |
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| 25 | (defun make-term-variable (ring nvars pos
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| 26 | &optional
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| 27 | (power 1)
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| 28 | (coeff (funcall (ring-unit ring)))
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| 29 | &aux
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| 30 | (monom (make-monom nvars :initial-element 0)))
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| 31 | (declare (fixnum nvars pos power))
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| 32 | (incf (monom-elt monom pos) power)
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| 33 | (make-term monom coeff))
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| 34 |
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| 35 | (defstruct (term
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| 36 | (:constructor make-term (monom coeff))
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| 37 | ;;(:constructor make-term-variable)
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| 38 | ;;(:type list)
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| 39 | )
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| 40 | (monom (make-monom 0) :type monom)
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| 41 | (coeff nil))
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| 42 |
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| 43 | (defun term-sugar (term)
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| 44 | (monom-sugar (term-monom term)))
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| 45 |
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| 46 | (defun termlist-sugar (p &aux (sugar -1))
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| 47 | (declare (fixnum sugar))
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| 48 | (dolist (term p sugar)
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| 49 | (setf sugar (max sugar (term-sugar term)))))
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| 50 |
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| 51 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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| 52 | ;;
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| 53 | ;; Additional structure operations on a list of terms
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| 54 | ;;
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| 55 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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| 56 |
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| 57 | (defun termlist-contract (p &optional (k 1))
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| 58 | "Eliminate first K variables from a polynomial P."
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| 59 | (mapcar #'(lambda (term) (make-term (monom-contract k (term-monom term))
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| 60 | (term-coeff term)))
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| 61 | p))
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| 62 |
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| 63 | (defun termlist-extend (p &optional (m (make-monom 1 :initial-element 0)))
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| 64 | "Extend every monomial in a polynomial P by inserting at the
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| 65 | beginning of every monomial the list of powers M."
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| 66 | (mapcar #'(lambda (term) (make-term (monom-append m (term-monom term))
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| 67 | (term-coeff term)))
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| 68 | p))
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| 69 |
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| 70 | (defun termlist-add-variables (p n)
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| 71 | "Add N variables to a polynomial P by inserting zero powers
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| 72 | at the beginning of each monomial."
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| 73 | (declare (fixnum n))
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| 74 | (mapcar #'(lambda (term)
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| 75 | (make-term (monom-append (make-monom n :initial-element 0)
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| 76 | (term-monom term))
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| 77 | (term-coeff term)))
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| 78 | p))
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