X-Git-Url: https://scm.cri.ensmp.fr/git/linpy.git/blobdiff_plain/114cd46edf08bcf13c5f489c449db98f6098c468..2de96003a48ae1ed91c853f38c72374a832824de:/pypol/domains.py

diff --git a/pypol/domains.py b/pypol/domains.py
index be9dd4b..122d428 100644
--- a/pypol/domains.py
+++ b/pypol/domains.py
@@ -340,6 +340,8 @@ class Domain(GeometricObject):
         Return a list of vertices for this Polygon.
         """
         from .polyhedra import Polyhedron
+        if not self.isbounded():
+            raise ValueError('domain must be bounded')
         islbset = self._toislbasicset(self.equalities, self.inequalities, self.symbols)
         vertices = libisl.isl_basic_set_compute_vertices(islbset);
         vertices = islhelper.isl_vertices_vertices(vertices)
@@ -443,6 +445,9 @@ class Domain(GeometricObject):
         return sorted(points, key=angles.get)
 
     def faces(self):
+        """
+        Returns the vertices of the faces of a polyhedra.
+        """
         faces = []
         for polyhedron in self.polyhedra:
             vertices = polyhedron.vertices()
@@ -503,6 +508,7 @@ class Domain(GeometricObject):
         axes.set_zlim(zmin, zmax)
         return axes
 
+
     def plot(self, plot=None, **kwargs):
         """
         Display plot of this set.
@@ -523,6 +529,10 @@ class Domain(GeometricObject):
         return False
 
     def subs(self, symbol, expression=None):
+        """
+        Subsitute the given value into an expression and return the resulting
+        expression.
+        """
         polyhedra = [polyhedron.subs(symbol, expression)
             for polyhedron in self.polyhedra]
         return Domain(*polyhedra)