From: Michael Orlitzky <michael@orlitzky.com>
Date: Wed, 24 Feb 2021 02:24:56 +0000 (-0500)
Subject: eja: simplify to_matrix() for elements.
X-Git-Url: https://gitweb.michael.orlitzky.com/?a=commitdiff_plain;h=028e405e8fd8672d0a68d21118305586a34927ad;p=sage.d.git

eja: simplify to_matrix() for elements.
---

diff --git a/mjo/eja/eja_element.py b/mjo/eja/eja_element.py
index 7388e96..347aa3c 100644
--- a/mjo/eja/eja_element.py
+++ b/mjo/eja/eja_element.py
@@ -1651,8 +1651,7 @@ class CartesianProductEJAElement(FiniteDimensionalEJAElement):
         # product spaces, even though they provide a method
         # with that name.
         pairs = zip(B, self.to_vector())
-        sigma = W.zero()
-        for (b,alpha) in pairs:
-            # sum(...) ALSO doesn't work on Cartesian products.
-            sigma += W(tuple(alpha*b_i for b_i in b))
-        return sigma
+        return sum( ( W(tuple(alpha*b_i for b_i in b))
+                      for (b,alpha) in pairs ),
+                    W.zero())
+