From: Danielle Bolan Date: Wed, 2 Jul 2014 09:10:14 +0000 (+0200) Subject: Add to drop_dims check next value, a little sloppy X-Git-Tag: 1.0~166 X-Git-Url: https://scm.cri.mines-paristech.fr/git/linpy.git/commitdiff_plain/8fe086b5ae03df5fadf1ec7de1aa41c0ace4a3ae?ds=inline;hp=10808766a204fcc854ae30fe471ada80bab1f60f Add to drop_dims check next value, a little sloppy --- diff --git a/pypol/domains.py b/pypol/domains.py index 6060dc9..bbb0946 100644 --- a/pypol/domains.py +++ b/pypol/domains.py @@ -5,7 +5,7 @@ import re from . import islhelper from .islhelper import mainctx, libisl, isl_set_basic_sets -from .linexprs import Expression, Symbol, symbolnames +from .linexprs import Expression __all__ = [ @@ -139,7 +139,7 @@ class Domain: def simplify(self): #does not change anything in any of the examples - #isl seems to do this naturally + #isl seems to do this naturally islset = self._toislset(self.polyhedra, self.symbols) islset = libisl.isl_set_remove_redundancies(islset) return self._fromislset(islset, self.symbols) @@ -152,18 +152,29 @@ class Domain: islbset = libisl.isl_set_polyhedral_hull(islset) return Polyhedron._fromislbasicset(islbset, self.symbols) - def project_out(self, symbols): - # use to remove certain variables - symbols = symbolnames(symbols) + def drop_dims(self, dims): + # use to remove certain variables use isl_set_drop_constraints_involving_dims instead? + from .polyhedra import Polyhedron + n = 1 + dims = list(dims) + symbols = list(self.symbols) islset = self._toislset(self.polyhedra, self.symbols) - # the trick is to walk symbols in reverse order, to avoid index updates - for index, symbol in reversed(list(enumerate(self.symbols))): - if symbol in symbols: - islset = libisl.isl_set_project_out(islset, libisl.isl_dim_set, index, 1) - # remaining symbols - symbols = [symbol for symbol in self.symbols if symbol not in symbols] - return Domain._fromislset(islset, symbols) - + for dim in dims: + dim_index = dims.index(dim) + if dim in symbols: + first = symbols.index(dim) + try: + if symbols[first+1] is dims[dim_index+1]: #check if next value in symbols is same as next value in dims + n += 1 + islbset = libisl.isl_set_project_out(islset, libisl.isl_dim_set, first, n) + symbols.__delitem__(first) + except: + islbset = libisl.isl_set_project_out(islset, libisl.isl_dim_set, first, n) + symbols.__delitem__(first) + else: + islbset = libisl.isl_set_project_out(islset, libisl.isl_dim_set, 0, 0) + return Polyhedron._fromislset(islbset, symbols) + def sample(self): from .polyhedra import Polyhedron islset = self._toislset(self.polyhedra, self.symbols) @@ -241,7 +252,6 @@ class Domain: self._dimension = len(self._symbols) return self - @classmethod def _toislset(cls, polyhedra, symbols): polyhedron = polyhedra[0] islbset = polyhedron._toislbasicset(polyhedron.equalities, @@ -338,7 +348,6 @@ class Domain: def tosympy(self): raise NotImplementedError - def And(*domains): if len(domains) == 0: from .polyhedra import Universe