Support for dummy symbols

[linpy.git] / examples / nsad2010.py

diff --git a/examples/nsad2010.py b/examples/nsad2010.py
index e2cacc7..1bf97d8 100755 (executable)
--- a/examples/nsad2010.py
+++ b/examples/nsad2010.py
@@ -2,17 +2,13 @@
 
 from pypol import *
 
-def affine_derivative_closure(T, x0s):
+def affine_derivative_closure(T, x0s, xs):
 
-    xs = [Symbol("{}'".format(x0.name)) for x0 in x0s]
-    dxs = [Symbol('d{}'.format(x0.name)) for x0 in x0s]
-    k = Symbol('k')
+    dxs = [x0.asdummy() for x0 in x0s]
+    k = Dummy('k')
 
     for x in T.symbols:
         assert x in x0s + xs
-    for dx in dxs:
-        assert dx.name not in T.symbols
-    assert k.name not in T.symbols
 
     T0 = T
 
@@ -48,5 +44,5 @@ i0, j0, i, j = symbols(['i', 'j', "i'", "j'"])
 T = Eq(i, i0 + 2) & Eq(j, j0 + 1)
 
 print('T =', T)
-Tstar = affine_derivative_closure(T, [i0, j0])
+Tstar = affine_derivative_closure(T, [i0, j0], [i, j])
 print('T* =', Tstar)