diff --git a/interp/grid/DD.py b/interp/grid/DD.py
index f9549f8..9bbee0b 100644
--- a/interp/grid/DD.py
+++ b/interp/grid/DD.py
@@ -17,13 +17,12 @@ class rect_grid(basegrid):
 
 
     verts = []
-    q      = []
+    q     = np.zeros( xres * yres )
     for x in xrange(xres):
       cur_x = xmin + (x * xdel)
       for y in xrange(yres):
         cur_y = ymin + (y * ydel)
         verts.append([cur_x, cur_y])
-        q.append(exact_func((cur_x, cur_y)))
     basegrid.__init__(self, verts, q)