# HG changeset patch
# User Martin Albrecht <malb@informatik.unibremen.de>
# Date 1206705996 0
# Node ID 052c3316ebee57851b1690718510b6d5bd2a6437
# Parent f05f0dbe324fd38b100c6c7ef536e8e85cf15fde
implement f.change_ring for f \in multivariate polynomial ring (fixes #1863)
diff r f05f0dbe324f r 052c3316ebee sage/rings/polynomial/multi_polynomial.pyx
a

b

cdef class MPolynomial(CommutativeRingEl 
535  535  """ 
536  536  q,r = self.quo_rem(other) 
537  537  return r 
 538  
 539  def change_ring(self, R): 
 540  """ 
 541  Return a copy of this polynomial but with coefficients in R, 
 542  if at all possible. 
 543  
 544  INPUT: 
 545  R  a ring 
 546  
 547  EXAMPLE: 
 548  sage: R.<x,y> = QQ[] 
 549  sage: f = x^3 + 3/5*y + 1 
 550  sage: f.change_ring(GF(7)) 
 551  x^3 + 2*y + 1 
 552  """ 
 553  P = self._parent 
 554  P = P.change_ring(R) 
 555  return P(self) 
538  556  
539  557  cdef remove_from_tuple(e, int ind): 
540  558  w = list(e) 