X-Git-Url: https://gitweb.michael.orlitzky.com/?a=blobdiff_plain;f=mjo%2Fmatrix_algebra.py;h=bd173eaba835b8b82632587e62fcf6a8e7ec4e44;hb=77d2d169ac8a3e46030ee98e6bdb45df418a59c2;hp=73286ff452adf3323a9fdf534dfbeba8c6777bbd;hpb=197e8fdf8737fabde9003bd093cf45527afd4568;p=sage.d.git

diff --git a/mjo/matrix_algebra.py b/mjo/matrix_algebra.py
index 73286ff..bd173ea 100644
--- a/mjo/matrix_algebra.py
+++ b/mjo/matrix_algebra.py
@@ -185,9 +185,8 @@ class MatrixAlgebra(CombinatorialFreeModule):
         if "Unital" in entry_algebra.category().axioms():
             category = category.Unital()
             entry_one = entry_algebra.one()
-            self.one = lambda: sum( (self.monomial((i,i,entry_one))
-                                     for i in range(self.nrows()) ),
-                                    self.zero() )
+            self.one = lambda: self.sum( (self.monomial((i,i,entry_one))
+                                     for i in range(self.nrows()) ) )
 
         if "Associative" in entry_algebra.category().axioms():
             category = category.Associative()
@@ -352,9 +351,10 @@ class MatrixAlgebra(CombinatorialFreeModule):
             # We have to convert alpha_g because a priori it lives in the
             # base ring of the entry algebra.
             R = self.base_ring()
-            return self.sum( R(alpha_g)*self.monomial( (i,l,g) )
-                             for (alpha_g, g)
-                             in zip(p, self.entry_algebra_gens()))
+            return self.sum_of_terms( (((i,l,g), R(alpha_g))
+                                      for (alpha_g, g)
+                                      in zip(p, self.entry_algebra_gens()) ),
+                                      distinct=True)
         else:
             return self.zero()
 
@@ -414,9 +414,10 @@ class MatrixAlgebra(CombinatorialFreeModule):
             # We have to convert alpha_g because a priori it lives in the
             # base ring of the entry algebra.
             R = self.base_ring()
-            return self.sum( R(alpha_g)*self.monomial( (i,j,g) )
-                             for (alpha_g, g)
-                             in zip(p, self.entry_algebra_gens()))
+            return self.sum_of_terms( (((i,j,g), R(alpha_g))
+                                      for (alpha_g, g)
+                                      in zip(p, self.entry_algebra_gens()) ),
+                                      distinct=True)
 
         return self.sum( entry_to_element(i,j,entries[i][j])
                          for j in range(ncols)