eja: fix representation of "zero" in MatrixAlgebra.

[sage.d.git] / mjo / matrix_algebra.py

diff --git a/mjo/matrix_algebra.py b/mjo/matrix_algebra.py
index bd173eaba835b8b82632587e62fcf6a8e7ec4e44..29a37d1e7c9bdee3dee6b36960126d5f545753fe 100644 (file)
--- a/mjo/matrix_algebra.py
+++ b/mjo/matrix_algebra.py
@@ -57,8 +57,18 @@ class MatrixAlgebraElement(IndexedFreeModuleElement):
             | 0 | 0 |
             +---+---+
 
+        TESTS::
+
+            sage: MatrixAlgebra(0,ZZ,ZZ).zero()
+            0
+
         """
-        return table(self.rows(), frame=True)._repr_()
+        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__()
+
+        return table(rs, frame=True)._repr_()
 
 
     def list(self):