X-Git-Url: http://gitweb.michael.orlitzky.com/?a=blobdiff_plain;f=mjo%2Fmatrix_algebra.py;h=bc46c2a67c5dacb69387592d3593ecfd29123779;hb=62d5ba7426cdf164ab6f0f92e6adcde6c6f98a2b;hp=bd173eaba835b8b82632587e62fcf6a8e7ec4e44;hpb=77d2d169ac8a3e46030ee98e6bdb45df418a59c2;p=sage.d.git

diff --git a/mjo/matrix_algebra.py b/mjo/matrix_algebra.py
index bd173ea..bc46c2a 100644
--- a/mjo/matrix_algebra.py
+++ b/mjo/matrix_algebra.py
@@ -57,7 +57,18 @@ class MatrixAlgebraElement(IndexedFreeModuleElement):
             | 0 | 0 |
             +---+---+
 
+        TESTS::
+
+            sage: MatrixAlgebra(0,ZZ,ZZ).zero()
+            []
+
         """
+        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. This is what MatrixSpace(...,
+            # 0) returns.
+            return "[]"
+
         return table(self.rows(), frame=True)._repr_()
 
 
@@ -137,7 +148,6 @@ class MatrixAlgebraElement(IndexedFreeModuleElement):
 
         TESTS::
 
-            sage: set_random_seed()
             sage: entries = QuaternionAlgebra(QQ,-1,-1)
             sage: M = MatrixAlgebra(3, entries, QQ)
             sage: M.random_element().matrix_space() == M