def invert(self, poly):
r"""
Inverted map to initial ring.
sage: from sage.rings.polynomial.pbori.pbori import *
sage: from sage.rings.polynomial.pbori.blocks import declare_ring, Block
sage: to_ring = declare_ring([Block("x", 10)], globals())
sage: from_ring = declare_ring([Block("y", 5), Block("x", 10)], globals())
sage: from sage.rings.polynomial.pbori.ll import RingMap
sage: mapping = RingMap(to_ring, from_ring)
sage: mapping.invert(mapping(x(1)+1))
x(1) + 1
"""
return substitute_variables(self.from_ring, self.from_map, poly)
def __call__(self, poly):
r"""
Execute the map to change rings.
TESTS::
sage: from sage.rings.polynomial.pbori.pbori import *
sage: from sage.rings.polynomial.pbori.blocks import declare_ring, Block
sage: to_ring = declare_ring([Block("x", 10)], globals())
sage: from_ring = declare_ring([Block("y", 5), Block("x", 10)], globals())
sage: from sage.rings.polynomial.pbori.ll import RingMap
sage: mapping = RingMap(to_ring, from_ring)
sage: mapping(x(1)+1)
x(1) + 1
"""
return substitute_variables(self.to_ring, self.to_map, poly)
def map_back(p):
return substitute_variables(from_ring, map_back_vec, p)
def map_from(p):
res = substitute_variables(to_ring, map_from_vec, p)
return res