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source: branches/f4grobner/ngrobner.lisp@ 2174

Last change on this file since 2174 was 1886, checked in by Marek Rychlik, 9 years ago

* empty log message *

File size: 2.0 KB
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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(in-package :ngrobner)
23
24;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
25;;
26;; Conversion from internal to infix form
27;;
28;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
29
30(defun coerce-to-infix (poly-type object vars)
31 "Write a polynomial, polynomial list, termlist term
32in infix form, using variables VARS. Can be used to display
33an internal form polynomial more readably."
34 (case poly-type
35 (:termlist
36 `(+ ,@(mapcar #'(lambda (term) (coerce-to-infix :term term vars)) object)))
37 (:polynomial
38 (coerce-to-infix :termlist (poly-termlist object) vars))
39 (:poly-list
40 `([ ,@(mapcar #'(lambda (p) (coerce-to-infix :polynomial p vars)) object)))
41 (:term
42 `(* ,(term-coeff object)
43 ,@(mapcar #'(lambda (var power) `(expt ,var ,power))
44 vars (coerce (term-monom object) 'list))))
45 (otherwise
46 object)))
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