From: Michael Orlitzky <michael@orlitzky.com>
Date: Tue, 9 Mar 2021 21:21:40 +0000 (-0500)
Subject: matrix_algebra: use "[]" for trivial matrices and fix a test.
X-Git-Url: http://gitweb.michael.orlitzky.com/?p=sage.d.git;a=commitdiff_plain;h=d2136d7696349ee48790818ed3927cbd9464e342

matrix_algebra: use "[]" for trivial matrices and fix a test.
---

diff --git a/mjo/hurwitz.py b/mjo/hurwitz.py
index 57f6578..10b308d 100644
--- a/mjo/hurwitz.py
+++ b/mjo/hurwitz.py
@@ -715,11 +715,11 @@ class ComplexMatrixAlgebra(HurwitzMatrixAlgebra):
         sage: (I,) = A.entry_algebra().gens()
         sage: A([ [1+I, 1],
         ....:     [-1, -I] ])
-        +-------+----+
-        | I + 1 | 1  |
-        +-------+----+
-        | -1    | -I |
-        +-------+----+
+        +---------+------+
+        | 1 + 1*I | 1    |
+        +---------+------+
+        | -1      | -1*I |
+        +---------+------+
 
     ::
 
diff --git a/mjo/matrix_algebra.py b/mjo/matrix_algebra.py
index 29a37d1..69d9aeb 100644
--- a/mjo/matrix_algebra.py
+++ b/mjo/matrix_algebra.py
@@ -60,15 +60,16 @@ class MatrixAlgebraElement(IndexedFreeModuleElement):
         TESTS::
 
             sage: MatrixAlgebra(0,ZZ,ZZ).zero()
-            0
+            []
 
         """
         if self.nrows() == 0 or self.ncols() == 0:
-            # Otherwise we get a crash or a blank space, depending
-            # on how hard we work for it.
-            return self.parent().entry_algebra().zero().__repr__()
+            # Otherwise we get a crash or a blank space, depending on
+            # how hard we work for it. This is what MatrixSpace(...,
+            # 0) returns.
+            return "[]"
 
-        return table(rs, frame=True)._repr_()
+        return table(self.rows(), frame=True)._repr_()
 
 
     def list(self):