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source: branches/f4grobner/mx-grobner.lisp@ 697

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1;;; -*- Mode: Lisp; Package: Maxima; Syntax: Common-Lisp; Base: 10 -*-
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
23;;
24;; Load this file into Maxima to bootstrap the Grobner package.
25;; NOTE: This file does use symbols defined by Maxima, so it
26;; will not work when loaded in Common Lisp.
27;;
28;; DETAILS: This file implements an interface between the Grobner
29;; basis package NGROBNER, which is a pure Common Lisp package, and
30;; Maxima. NGROBNER for efficiency uses its own representation of
31;; polynomials. Thus, it is necessary to convert Maxima representation
32;; to the internal representation and back. The facilities to do so
33;; are implemented in this file.
34;;
35;; Also, since the NGROBNER package consists of many Lisp files, it is
36;; necessary to load the files. It is possible and preferrable to use
37;; ASDF for this purpose. The default is ASDF. It is also possible to
38;; simply used LOAD and COMPILE-FILE to accomplish this task.
39;;
40;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
41
42(in-package :maxima)
43
44(macsyma-module cgb-maxima)
45
46
47(eval-when
48 #+gcl (load eval)
49 #-gcl (:load-toplevel :execute)
50 (format t "~&Loading maxima-grobner ~a ~a~%"
51 "$Revision: 2.0 $" "$Date: 2015/06/02 0:34:17 $"))
52
53;;FUNCTS is loaded because it contains the definition of LCM
54#($load "functs")
55#+sbcl(progn (require 'asdf) (load "ngrobner.asd")(asdf:load-system :ngrobner))
56
57(use-package :ngrobner)
58
59
60;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
61;;
62;; Maxima expression ring
63;;
64;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
65;;
66;; This is how we perform operations on coefficients
67;; using Maxima functions.
68;;
69;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
70
71(defparameter *maxima-ring*
72 (make-ring
73 ;;(defun coeff-zerop (expr) (meval1 `(($is) (($equal) ,expr 0))))
74 :parse #'(lambda (expr)
75 (when modulus (setf expr ($rat expr)))
76 expr)
77 :unit #'(lambda () (if modulus ($rat 1) 1))
78 :zerop #'(lambda (expr)
79 ;;When is exactly a maxima expression equal to 0?
80 (cond ((numberp expr)
81 (= expr 0))
82 ((atom expr) nil)
83 (t
84 (case (caar expr)
85 (mrat (eql ($ratdisrep expr) 0))
86 (otherwise (eql ($totaldisrep expr) 0))))))
87 :add #'(lambda (x y) (m+ x y))
88 :sub #'(lambda (x y) (m- x y))
89 :uminus #'(lambda (x) (m- x))
90 :mul #'(lambda (x y) (m* x y))
91 ;;(defun coeff-div (x y) (cadr ($divide x y)))
92 :div #'(lambda (x y) (m// x y))
93 :lcm #'(lambda (x y) (meval1 `((|$LCM|) ,x ,y)))
94 :ezgcd #'(lambda (x y) (apply #'values (cdr ($ezgcd ($totaldisrep x) ($totaldisrep y)))))
95 ;; :gcd #'(lambda (x y) (second ($ezgcd x y)))))
96 :gcd #'(lambda (x y) ($gcd x y))))
97
98;; Rebind some global variables for Maxima environment
99(setf *expression-ring* *maxima-ring* ; Coefficient arithmetic done by Maxima
100 *ratdisrep-fun* '$ratdisrep ; Coefficients are converted to general form
101 )
102
103;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
104;;
105;; Maxima expression parsing
106;;
107;;
108;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
109;;
110;; Functions and macros dealing with internal representation
111;; structure.
112;;
113;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
114
115(defun equal-test-p (expr1 expr2)
116 (alike1 expr1 expr2))
117
118(defun coerce-maxima-list (expr)
119 "Convert a Maxima list to Lisp list."
120 (cond
121 ((and (consp (car expr)) (eql (caar expr) 'mlist)) (cdr expr))
122 (t expr)))
123
124(defun free-of-vars (expr vars) (apply #'$freeof `(,@vars ,expr)))
125
126(defun parse-poly (expr vars &aux (vars (coerce-maxima-list vars)))
127 "Convert a maxima polynomial expression EXPR in variables VARS to internal form."
128 (labels ((parse (arg) (parse-poly arg vars))
129 (parse-list (args) (mapcar #'parse args)))
130 (cond
131 ((eql expr 0) (make-poly-zero))
132 ((member expr vars :test #'equal-test-p)
133 (let ((pos (position expr vars :test #'equal-test-p)))
134 (make-variable *expression-ring* (length vars) pos)))
135 ((free-of-vars expr vars)
136 ;;This means that variable-free CRE and Poisson forms will be converted
137 ;;to coefficients intact
138 (coerce-coeff *expression-ring* expr vars))
139 (t
140 (case (caar expr)
141 (mplus (reduce #'(lambda (x y) (poly-add *expression-ring* x y)) (parse-list (cdr expr))))
142 (mminus (poly-uminus *expression-ring* (parse (cadr expr))))
143 (mtimes
144 (if (endp (cddr expr)) ;unary
145 (parse (cdr expr))
146 (reduce #'(lambda (p q) (poly-mul *expression-ring* p q)) (parse-list (cdr expr)))))
147 (mexpt
148 (cond
149 ((member (cadr expr) vars :test #'equal-test-p)
150 ;;Special handling of (expt var pow)
151 (let ((pos (position (cadr expr) vars :test #'equal-test-p)))
152 (make-variable *expression-ring* (length vars) pos (caddr expr))))
153 ((not (and (integerp (caddr expr)) (plusp (caddr expr))))
154 ;; Negative power means division in coefficient ring
155 ;; Non-integer power means non-polynomial coefficient
156 (mtell "~%Warning: Expression ~%~M~%contains power which is not a positive integer. Parsing as coefficient.~%"
157 expr)
158 (coerce-coeff *expression-ring* expr vars))
159 (t (poly-expt *expression-ring* (parse (cadr expr)) (caddr expr)))))
160 (mrat (parse ($ratdisrep expr)))
161 (mpois (parse ($outofpois expr)))
162 (otherwise
163 (coerce-coeff *expression-ring* expr vars)))))))
164
165(defun parse-poly-list (expr vars)
166 "Parse a Maxima representation of a list of polynomials."
167 (case (caar expr)
168 (mlist (mapcar #'(lambda (p) (parse-poly p vars)) (cdr expr)))
169 (t (merror "Expression ~M is not a list of polynomials in variables ~M."
170 expr vars))))
171
172(defun parse-poly-list-list (poly-list-list vars)
173 "Parse a Maxima representation of a list of lists of polynomials."
174 (mapcar #'(lambda (g) (parse-poly-list g vars)) (coerce-maxima-list poly-list-list)))
175
176
177;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
178;;
179;; Conversion from internal form to Maxima general form
180;;
181;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
182
183(defun maxima-head ()
184 (if $poly_return_term_list
185 '(mlist)
186 '(mplus)))
187
188(defun coerce-to-maxima (poly-type object vars)
189 (case poly-type
190 (:polynomial
191 `(,(maxima-head) ,@(mapcar #'(lambda (term) (coerce-to-maxima :term term vars)) (poly-termlist object))))
192 (:poly-list
193 `((mlist) ,@(mapcar #'(lambda (p) (funcall *ratdisrep-fun* (coerce-to-maxima :polynomial p vars))) object)))
194 (:term
195 `((mtimes) ,(funcall *ratdisrep-fun* (term-coeff object))
196 ,@(mapcar #'(lambda (var power) `((mexpt) ,var ,power))
197 vars (monom-exponents (term-monom object)))))
198 ;; Assumes that Lisp and Maxima logicals coincide
199 (:logical object)
200 (otherwise
201 object)))
202
203
204;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
205;;
206;; Unary and binary operation definition facility
207;;
208;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
209
210(defmacro define-unop (maxima-name fun-name
211 &optional (documentation nil documentation-supplied-p))
212 "Define a MAXIMA-level unary operator MAXIMA-NAME corresponding to unary function FUN-NAME."
213 `(defun ,maxima-name (p vars
214 &aux
215 (vars (coerce-maxima-list vars))
216 (p (parse-poly p vars)))
217 ,@(when documentation-supplied-p (list documentation))
218 (coerce-to-maxima :polynomial (,fun-name *expression-ring* p) vars)))
219
220(defmacro define-binop (maxima-name fun-name
221 &optional (documentation nil documentation-supplied-p))
222 "Define a MAXIMA-level binary operator MAXIMA-NAME corresponding to binary function FUN-NAME."
223 `(defmfun ,maxima-name (p q vars
224 &aux
225 (vars (coerce-maxima-list vars))
226 (p (parse-poly p vars))
227 (q (parse-poly q vars)))
228 ,@(when documentation-supplied-p (list documentation))
229 (coerce-to-maxima :polynomial (,fun-name *expression-ring* p q) vars)))
230
231
232;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
233;;
234;; Facilities for evaluating Grobner package expressions
235;; within a prepared environment
236;;
237;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
238
239(defmacro with-monomial-order ((order) &body body)
240 "Evaluate BODY with monomial order set to ORDER."
241 `(let ((*monomial-order* (or (find-order ,order) *monomial-order*)))
242 . ,body))
243
244(defmacro with-coefficient-ring ((ring) &body body)
245 "Evaluate BODY with coefficient ring set to RING."
246 `(let ((*expression-ring* (or (find-ring ,ring) *expression-ring*)))
247 . ,body))
248
249(defmacro with-elimination-orders ((primary secondary elimination-order)
250 &body body)
251 "Evaluate BODY with primary and secondary elimination orders set to PRIMARY and SECONDARY."
252 `(let ((*primary-elimination-order* (or (find-order ,primary) *primary-elimination-order*))
253 (*secondary-elimination-order* (or (find-order ,secondary) *secondary-elimination-order*))
254 (*elimination-order* (or (find-order ,elimination-order) *elimination-order*)))
255 . ,body))
256
257
258;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
259;;
260;; Maxima-level interface functions
261;;
262;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
263
264;; Auxillary function for removing zero polynomial
265(defun remzero (plist) (remove #'poly-zerop plist))
266
267;;Simple operators
268
269(define-binop $poly_add poly-add
270 "Adds two polynomials P and Q")
271
272(define-binop $poly_subtract poly-sub
273 "Subtracts a polynomial Q from P.")
274
275(define-binop $poly_multiply poly-mul
276 "Returns the product of polynomials P and Q.")
277
278(define-binop $poly_s_polynomial spoly
279 "Returns the syzygy polynomial (S-polynomial) of two polynomials P and Q.")
280
281(define-unop $poly_primitive_part poly-primitive-part
282 "Returns the polynomial P divided by GCD of its coefficients.")
283
284(define-unop $poly_normalize poly-normalize
285 "Returns the polynomial P divided by the leading coefficient.")
286
287;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
288;;
289;; Macro facility for writing Maxima-level wrappers for
290;; functions operating on internal representation
291;;
292;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
293
294(defmacro with-parsed-polynomials (((maxima-vars &optional (maxima-new-vars nil new-vars-supplied-p))
295 &key (polynomials nil)
296 (poly-lists nil)
297 (poly-list-lists nil)
298 (value-type nil))
299 &body body
300 &aux (vars (gensym))
301 (new-vars (gensym)))
302 `(let ((,vars (coerce-maxima-list ,maxima-vars))
303 ,@(when new-vars-supplied-p
304 (list `(,new-vars (coerce-maxima-list ,maxima-new-vars)))))
305 (coerce-to-maxima
306 ,value-type
307 (with-coefficient-ring ($poly_coefficient_ring)
308 (with-monomial-order ($poly_monomial_order)
309 (with-elimination-orders ($poly_primary_elimination_order
310 $poly_secondary_elimination_order
311 $poly_elimination_order)
312 (let ,(let ((args nil))
313 (dolist (p polynomials args)
314 (setf args (cons `(,p (parse-poly ,p ,vars)) args)))
315 (dolist (p poly-lists args)
316 (setf args (cons `(,p (parse-poly-list ,p ,vars)) args)))
317 (dolist (p poly-list-lists args)
318 (setf args (cons `(,p (parse-poly-list-list ,p ,vars)) args))))
319 . ,body))))
320 ,(if new-vars-supplied-p
321 `(append ,vars ,new-vars)
322 vars))))
323
324
325;;Functions
326
327(defmfun $poly_expand (p vars)
328 "This function is equivalent to EXPAND(P) if P parses correctly to a polynomial.
329If the representation is not compatible with a polynomial in variables VARS,
330the result is an error."
331 (with-parsed-polynomials ((vars) :polynomials (p)
332 :value-type :polynomial)
333 p))
334
335(defmfun $poly_expt (p n vars)
336 (with-parsed-polynomials ((vars) :polynomials (p) :value-type :polynomial)
337 (poly-expt *expression-ring* p n)))
338
339(defmfun $poly_content (p vars)
340 (with-parsed-polynomials ((vars) :polynomials (p))
341 (poly-content *expression-ring* p)))
342
343(defmfun $poly_pseudo_divide (f fl vars
344 &aux (vars (coerce-maxima-list vars))
345 (f (parse-poly f vars))
346 (fl (parse-poly-list fl vars)))
347 (multiple-value-bind (quot rem c division-count)
348 (poly-pseudo-divide *expression-ring* f fl)
349 `((mlist)
350 ,(coerce-to-maxima :poly-list quot vars)
351 ,(coerce-to-maxima :polynomial rem vars)
352 ,c
353 ,division-count)))
354
355(defmfun $poly_exact_divide (f g vars)
356 (with-parsed-polynomials ((vars) :polynomials (f g) :value-type :polynomial)
357 (poly-exact-divide *expression-ring* f g)))
358
359(defmfun $poly_normal_form (f fl vars)
360 (with-parsed-polynomials ((vars) :polynomials (f)
361 :poly-lists (fl)
362 :value-type :polynomial)
363 (normal-form *expression-ring* f (remzero fl) nil)))
364
365(defmfun $poly_buchberger_criterion (g vars)
366 (with-parsed-polynomials ((vars) :poly-lists (g) :value-type :logical)
367 (buchberger-criterion *expression-ring* g)))
368
369(defmfun $poly_buchberger (fl vars)
370 (with-parsed-polynomials ((vars) :poly-lists (fl) :value-type :poly-list)
371 (buchberger *expression-ring* (remzero fl) 0 nil)))
372
373(defmfun $poly_reduction (plist vars)
374 (with-parsed-polynomials ((vars) :poly-lists (plist)
375 :value-type :poly-list)
376 (reduction *expression-ring* plist)))
377
378(defmfun $poly_minimization (plist vars)
379 (with-parsed-polynomials ((vars) :poly-lists (plist)
380 :value-type :poly-list)
381 (minimization plist)))
382
383(defmfun $poly_normalize_list (plist vars)
384 (with-parsed-polynomials ((vars) :poly-lists (plist)
385 :value-type :poly-list)
386 (poly-normalize-list *expression-ring* plist)))
387
388(defmfun $poly_grobner (f vars)
389 (with-parsed-polynomials ((vars) :poly-lists (f)
390 :value-type :poly-list)
391 (grobner *expression-ring* (remzero f))))
392
393(defmfun $poly_reduced_grobner (f vars)
394 (with-parsed-polynomials ((vars) :poly-lists (f)
395 :value-type :poly-list)
396 (reduced-grobner *expression-ring* (remzero f))))
397
398(defmfun $poly_depends_p (p var mvars
399 &aux (vars (coerce-maxima-list mvars))
400 (pos (position var vars)))
401 (if (null pos)
402 (merror "~%Variable ~M not in the list of variables ~M." var mvars)
403 (poly-depends-p (parse-poly p vars) pos)))
404
405(defmfun $poly_elimination_ideal (flist k vars)
406 (with-parsed-polynomials ((vars) :poly-lists (flist)
407 :value-type :poly-list)
408 (elimination-ideal *expression-ring* flist k nil 0)))
409
410(defmfun $poly_colon_ideal (f g vars)
411 (with-parsed-polynomials ((vars) :poly-lists (f g) :value-type :poly-list)
412 (colon-ideal *expression-ring* f g nil)))
413
414(defmfun $poly_ideal_intersection (f g vars)
415 (with-parsed-polynomials ((vars) :poly-lists (f g) :value-type :poly-list)
416 (ideal-intersection *expression-ring* f g nil)))
417
418(defmfun $poly_lcm (f g vars)
419 (with-parsed-polynomials ((vars) :polynomials (f g) :value-type :polynomial)
420 (poly-lcm *expression-ring* f g)))
421
422(defmfun $poly_gcd (f g vars)
423 ($first ($divide (m* f g) ($poly_lcm f g vars))))
424
425(defmfun $poly_grobner_equal (g1 g2 vars)
426 (with-parsed-polynomials ((vars) :poly-lists (g1 g2))
427 (grobner-equal *expression-ring* g1 g2)))
428
429(defmfun $poly_grobner_subsetp (g1 g2 vars)
430 (with-parsed-polynomials ((vars) :poly-lists (g1 g2))
431 (grobner-subsetp *expression-ring* g1 g2)))
432
433(defmfun $poly_grobner_member (p g vars)
434 (with-parsed-polynomials ((vars) :polynomials (p) :poly-lists (g))
435 (grobner-member *expression-ring* p g)))
436
437(defmfun $poly_ideal_saturation1 (f p vars)
438 (with-parsed-polynomials ((vars) :poly-lists (f) :polynomials (p)
439 :value-type :poly-list)
440 (ideal-saturation-1 *expression-ring* f p 0)))
441
442(defmfun $poly_saturation_extension (f plist vars new-vars)
443 (with-parsed-polynomials ((vars new-vars)
444 :poly-lists (f plist)
445 :value-type :poly-list)
446 (saturation-extension *expression-ring* f plist)))
447
448(defmfun $poly_polysaturation_extension (f plist vars new-vars)
449 (with-parsed-polynomials ((vars new-vars)
450 :poly-lists (f plist)
451 :value-type :poly-list)
452 (polysaturation-extension *expression-ring* f plist)))
453
454(defmfun $poly_ideal_polysaturation1 (f plist vars)
455 (with-parsed-polynomials ((vars) :poly-lists (f plist)
456 :value-type :poly-list)
457 (ideal-polysaturation-1 *expression-ring* f plist 0 nil)))
458
459(defmfun $poly_ideal_saturation (f g vars)
460 (with-parsed-polynomials ((vars) :poly-lists (f g)
461 :value-type :poly-list)
462 (ideal-saturation *expression-ring* f g 0 nil)))
463
464(defmfun $poly_ideal_polysaturation (f ideal-list vars)
465 (with-parsed-polynomials ((vars) :poly-lists (f)
466 :poly-list-lists (ideal-list)
467 :value-type :poly-list)
468 (ideal-polysaturation *expression-ring* f ideal-list 0 nil)))
469
470(defmfun $poly_lt (f vars)
471 (with-parsed-polynomials ((vars) :polynomials (f) :value-type :polynomial)
472 (make-poly-from-termlist (list (poly-lt f)))))
473
474(defmfun $poly_lm (f vars)
475 (with-parsed-polynomials ((vars) :polynomials (f) :value-type :polynomial)
476 (make-poly-from-termlist (list (make-term (poly-lm f) (funcall (ring-unit *expression-ring*)))))))
477
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