Add helper function islhelper.isl_set_points()

[linpy.git] / pypol / domains.py

diff --git a/pypol/domains.py b/pypol/domains.py
index 74351fc..a2650e4 100644 (file)
--- 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
+from .linexprs import Expression, Symbol
 
 
 __all__ = [
@@ -50,7 +50,7 @@ class Domain:
         symbols = set()
         for item in iterator:
             symbols.update(item.symbols)
-        return tuple(sorted(symbols, key=lambda symbol: symbol.name))
+        return tuple(sorted(symbols, key=Symbol.sortkey))
 
     @property
     def polyhedra(self):
@@ -152,20 +152,20 @@ class Domain:
         islbset = libisl.isl_set_polyhedral_hull(islset)
         return Polyhedron._fromislbasicset(islbset, self.symbols)
 
-    def project_out(self, symbols):
+    def project_out(self, dims):
         # use to remove certain variables
         islset = self._toislset(self.polyhedra, self.symbols)
         n = 0
         for index, symbol in reversed(list(enumerate(self.symbols))):
-            if symbol in symbols:
+            if symbol in dims:
                 n += 1
             elif n > 0:
                 islset = libisl.isl_set_project_out(islset, libisl.isl_dim_set, index + 1, n)
                 n = 0
         if n > 0:
             islset = libisl.isl_set_project_out(islset, libisl.isl_dim_set, 0, n)
-        symbols = [symbol for symbol in self.symbols if symbol not in symbols]
-        return Domain._fromislset(islset, symbols)
+        dims = [symbol for symbol in self.symbols if symbol not in dims]
+        return Domain._fromislset(islset, dims)
 
     def sample(self):
         from .polyhedra import Polyhedron
@@ -221,6 +221,31 @@ class Domain:
         islset = self._toislset(self.polyhedra, self.symbols)
         islset = libisl.isl_set_lexmax(islset)
         return self._fromislset(islset, self.symbols)
+    
+    def num_parameters(self):
+        #could be useful with large, complicated polyhedrons
+        islbset = self._toislbasicset(self.equalities, self.inequalities, self.symbols)
+        num = libisl.isl_basic_set_dim(islbset, libisl.isl_dim_set)
+        return num
+    
+    def involves_dims(self, dims):
+        #could be useful with large, complicated polyhedrons
+        islset = self._toislset(self.polyhedra, self.symbols)
+        dims = sorted(dims)
+        symbols = sorted(list(self.symbols))
+        n = 0
+        if len(dims)>0:
+            for dim in dims:
+                if dim in symbols:
+                    first = symbols.index(dims[0])
+                    n +=1  
+                else:
+                    first = 0
+        else: 
+            return False            
+        value = bool(libisl.isl_set_involves_dims(islset, libisl.isl_dim_set, first, n))
+        libisl.isl_set_free(islset)
+        return value
 
     @classmethod
     def _fromislset(cls, islset, symbols):