# HG changeset patch
# User Tom Coates <tomc@imperial.ac.uk>
# Date 1311105549 -3600
# Node ID 644022108de5f1a0799d3299b2c9ac6a90f202ce
# Parent  ce324e28c3334398d3552640e2cb1520d22465a3
workaround for trac 11358

diff -r ce324e28c333 -r 644022108de5 sage/matrix/matrix_integer_dense.pyx
--- a/sage/matrix/matrix_integer_dense.pyx	Mon May 23 13:36:51 2011 +0000
+++ b/sage/matrix/matrix_integer_dense.pyx	Tue Jul 19 20:59:09 2011 +0100
@@ -776,16 +776,24 @@
 
     cdef sage.structure.element.Matrix _matrix_times_matrix_(self, sage.structure.element.Matrix right):
         
-        #############
-        # see the tune_multiplication function below.
-        n = max(self._nrows, self._ncols, right._nrows, right._ncols)
-        if n <= 20:
-            return self._multiply_classical(right)
-        a = self.height(); b = right.height()
-        if float(max(a,b)) / float(n) >= 0.70:
-            return self._multiply_classical(right)
-        else:
-            return self._multiply_multi_modular(right)
+        ############################################################
+        ##
+        ## this is an ugly kludge to work around trac 11358
+        ## I just turned off multi-modular multiplication under
+        ## all circumstances
+        ##
+        ############################################################
+        return self._multiply_classical(right)
+        # #############
+        # # see the tune_multiplication function below.
+        # n = max(self._nrows, self._ncols, right._nrows, right._ncols)
+        # if n <= 20:
+        #     return self._multiply_classical(right)
+        # a = self.height(); b = right.height()
+        # if float(max(a,b)) / float(n) >= 0.70:
+        #     return self._multiply_classical(right)
+        # else:
+        #     return self._multiply_multi_modular(right)
 
     cpdef ModuleElement _lmul_(self, RingElement right):
         """