Changeset 219

Timestamp:

2015-06-05T15:34:27-07:00 (9 years ago)

Author:

Marek Rychlik

Message:

* empty log message *

File:

• branches/f4grobner/mx-grobner.lisp (modified) (1 diff)

branches/f4grobner/mx-grobner.lisp

@@ -200 +200 @@
 
 
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;;
+;; Facilities for evaluating Grobner package expressions
+;; within a prepared environment
+;;
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defmacro with-monomial-order ((order) &body body)
+  "Evaluate BODY with monomial order set to ORDER."
+  `(let ((*monomial-order* (or (find-order ,order) *monomial-order*)))
+     . ,body))
+
+(defmacro with-coefficient-ring ((ring) &body body)
+  "Evaluate BODY with coefficient ring set to RING."
+  `(let ((*coefficient-ring* (or (find-ring ,ring) *coefficient-ring*)))
+     . ,body))
+
+(defmacro with-elimination-orders ((primary secondary elimination-order)
+                                   &body body)
+  "Evaluate BODY with primary and secondary elimination orders set to PRIMARY and SECONDARY."
+  `(let ((*primary-elimination-order* (or (find-order ,primary)  *primary-elimination-order*))
+         (*secondary-elimination-order* (or (find-order ,secondary) *secondary-elimination-order*))
+         (*elimination-order* (or (find-order ,elimination-order) *elimination-order*)))
+     . ,body))
+
+
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 ;;