# HG changeset patch
# User Joseph Turian <turian@gmail.com>
# Date 1215411314 14400
# Node ID 42cc94cf6c122490c7c7c82c20c8be15e0a8a1ab
# Parent  75bab24bb2d8e9ea395f6bcfe7c7eb1bd74770af
No update if there aren't any non-zeros

diff -r 75bab24bb2d8 -r 42cc94cf6c12 sparse_random_autoassociator/model.py
--- a/sparse_random_autoassociator/model.py	Mon Jul 07 02:06:15 2008 -0400
+++ b/sparse_random_autoassociator/model.py	Mon Jul 07 02:15:14 2008 -0400
@@ -50,6 +50,8 @@
         are correct (i.e. are truly nonzero/zero).
         """
         (nonzero_indices, zero_indices) = _select_indices(instance)
+        # No update if there aren't any non-zeros.
+        if len(nonzero_indices) == 0: return
         xnonzero = numpy.asarray([instance[idx] for idx in nonzero_indices])
         print
         print "xnonzero:", xnonzero