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Changeset 1295 for branches


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Timestamp:
2015-06-11T20:44:58-07:00 (9 years ago)
Author:
Marek Rychlik
Message:

* empty log message *

File:
1 edited

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  • branches/f4grobner/division.lisp

    r1294 r1295  
    243243  "Divide every polynomial in a list PLIST by its leading coefficient. "
    244244  (mapcar #'(lambda (x) (poly-normalize ring x)) plist))
    245 
    246 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
    247 ;;
    248 ;; These are provided mostly for debugging purposes To enable
    249 ;; verification of grobner bases with BUCHBERGER-CRITERION, do
    250 ;; (pushnew :grobner-check *features*) and compile/load this file.
    251 ;; With this feature, the calculations will slow down CONSIDERABLY.
    252 ;;
    253 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
    254 
    255 (defun grobner-test (ring g f)
    256   "Test whether G is a Grobner basis and F is contained in G. Return T
    257 upon success and NIL otherwise."
    258   (debug-cgb "~&GROBNER CHECK: ")
    259   (let (($poly_grobner_debug nil)
    260         (stat1 (buchberger-criterion ring g))
    261         (stat2
    262           (every #'poly-zerop
    263                  (makelist (normal-form ring (copy-tree (elt f i)) g nil)
    264                            (i 0 (1- (length f)))))))
    265     (unless stat1 (error "~&Buchberger criterion failed."))
    266     (unless stat2
    267       (error "~&Original polys not in ideal spanned by Grobner.")))
    268   (debug-cgb "~&GROBNER CHECK END")
    269   t)
    270 
    271 
    272 
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