BUG: fix call of randn

mcutils/surface/orientation.py

@@ -76,7 +76,7 @@ class WeightedOrientation(object):
             4. number between 0 and 0.5 indicating location along shortest line (0 if at edge, 0.5 if in middle of gyrus)
         """
         if self.smooth_orient.shape[0] != norient:
-            rand_orient = np.randn(3, norient)
+            rand_orient = np.random.randn(3, norient)
             rand_orient /= np.sqrt(np.sum(rand_orient ** 2, 0))
 
             hsph_initial = sphere.HemiSphere(*rand_orient)