| 1 | ;;; -*- Mode: Lisp -*-
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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 | ;;
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| 26 | ;; Conversion from internal to infix form
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| 27 | ;;
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| 28 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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| 29 |
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| 30 | (defun coerce-to-infix (poly-type object vars)
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| 31 | "Write a polynomial, polynomial list, termlist term
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| 32 | in infix form, using variables VARS. Can be used to display
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| 33 | an internal form polynomial more readably."
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| 34 | (case poly-type
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| 35 | (:termlist
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| 36 | `(+ ,@(mapcar #'(lambda (term) (coerce-to-infix :term term vars)) object)))
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| 37 | (:polynomial
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| 38 | (coerce-to-infix :termlist (poly-termlist object) vars))
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| 39 | (:poly-list
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| 40 | `([ ,@(mapcar #'(lambda (p) (coerce-to-infix :polynomial p vars)) object)))
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| 41 | (:term
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| 42 | `(* ,(term-coeff object)
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| 43 | ,@(mapcar #'(lambda (var power) `(expt ,var ,power))
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| 44 | vars (coerce (term-monom object) 'list))))
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| 45 | (otherwise
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| 46 | object)))
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