Raise ValueError when sampling an empty Domain

[linpy.git] / examples / squares.py

diff --git a/examples/squares.py b/examples/squares.py
index d606631..4389d87 100755 (executable)
--- a/examples/squares.py
+++ b/examples/squares.py
@@ -11,22 +11,23 @@ sq4 = Le(1, x) & Le(x, 2) & Le(1, y) & Le(y, 2)
 sq5 = Le(1, x) & Le(x, 2) & Le(1, y)
 sq6 = Le(1, x) & Le(x, 2) & Le(1, y) & Eq(y, 3)
 sq7 = Le(0, x) & Le(x, 2) & Le(0, y) & Eq(z, 2) & Le(a, 3)
 sq5 = Le(1, x) & Le(x, 2) & Le(1, y)
 sq6 = Le(1, x) & Le(x, 2) & Le(1, y) & Eq(y, 3)
 sq7 = Le(0, x) & Le(x, 2) & Le(0, y) & Eq(z, 2) & Le(a, 3)

-u = Polyhedron([])
-x = sq1 - sq2
+universe = Polyhedron([])
+q = sq1 - sq2
+e = Empty

 
 print('sq1 =', sq1) #print correct square
 print('sq2 =', sq2) #print correct square
 print('sq3 =', sq3) #print correct square
 print('sq4 =', sq4) #print correct square
 
 print('sq1 =', sq1) #print correct square
 print('sq2 =', sq2) #print correct square
 print('sq3 =', sq3) #print correct square
 print('sq4 =', sq4) #print correct square

-print('u =', u) #print correct square
+print('universe =', universe) #print correct square

 print()
 print('¬sq1 =', ~sq1) #test complement
 print()
 print('sq1 + sq1 =', sq1 + sq2) #test addition
 print('sq1 + sq2 =', Polyhedron(sq1 + sq2)) #test addition
 print()
 print()
 print('¬sq1 =', ~sq1) #test complement
 print()
 print('sq1 + sq1 =', sq1 + sq2) #test addition
 print('sq1 + sq2 =', Polyhedron(sq1 + sq2)) #test addition
 print()

-print('u + u =', u + u)#test addition
-print('u - u =', u - u) #test subtraction
+print('universe + universe =', universe + universe)#test addition
+print('universe - universe =', universe - universe) #test subtraction

 print()
 print('sq2 - sq1 =', sq2 - sq1) #test subtraction
 print('sq2 - sq1 =', Polyhedron(sq2 - sq1)) #test subtraction
 print()
 print('sq2 - sq1 =', sq2 - sq1) #test subtraction
 print('sq2 - sq1 =', Polyhedron(sq2 - sq1)) #test subtraction


@@ -43,7 +44,7 @@ print('sq1 disjoint:', sq1.disjoint()) #make disjoint
 print('sq2 disjoint:', sq2.disjoint()) #make disjoint
 print()
 print('is square 1 universe?:', sq1.isuniverse()) #test if square is universe
 print('sq2 disjoint:', sq2.disjoint()) #make disjoint
 print()
 print('is square 1 universe?:', sq1.isuniverse()) #test if square is universe

-print('is u universe?:', u.isuniverse()) #test if square is universe
+print('is u universe?:', universe.isuniverse()) #test if square is universe

 print()
 print('is sq1 a subset of sq2?:', sq1.issubset(sq2)) #test issubset()
 print('is sq4 less than sq3?:', sq4.__lt__(sq3)) # test lt(), must be a strict subset
 print()
 print('is sq1 a subset of sq2?:', sq1.issubset(sq2)) #test issubset()
 print('is sq4 less than sq3?:', sq4.__lt__(sq3)) # test lt(), must be a strict subset


@@ -54,8 +55,7 @@ print()
 print('lexographic min of sq2:', sq2.lexmin()) #test lexmax()
 print('lexographic max of sq2:', sq2.lexmax()) #test lexmax()
 print()
 print('lexographic min of sq2:', sq2.lexmin()) #test lexmax()
 print('lexographic max of sq2:', sq2.lexmax()) #test lexmax()
 print()

-print('Polyhedral hull of sq1 + sq2 is:', x.polyhedral_hull()) #test polyhedral hull, returns same
-                                                               #value as Polyhedron(sq1 + sq2)
+print('Polyhedral hull of sq1 + sq2 is:', q.aspolyhedron()) #test polyhedral hull

 print()
 print('is sq1 bounded?', sq1.isbounded()) #unbounded should return True
 print('is sq5 bounded?', sq5.isbounded()) #unbounded should return False
 print()
 print('is sq1 bounded?', sq1.isbounded()) #unbounded should return True
 print('is sq5 bounded?', sq5.isbounded()) #unbounded should return False


@@ -63,5 +63,9 @@ print()
 print('sq6:', sq6)
 print('sq6 simplified:', sq6.sample())
 print()
 print('sq6:', sq6)
 print('sq6 simplified:', sq6.sample())
 print()

-#print(u.drop_dims(' '))
-print('sq7 with out constraints involving y and a', sq7.drop_dims('y a')) #drops dims that are passed
+print(universe.project([x]))
+print('sq7 with out constraints involving y and a', sq7.project([a, z, x, y])) #drops dims that are passed
+print()
+print('sq1 has {} parameters'.format(sq1.num_parameters()))
+print()
+print('does sq1 constraints involve x?', sq1.involves_dims([x]))