--- a
+++ b/inst/__intersectSingleInt__.m
@@ -0,0 +1,33 @@
+## Copyright (C) 2008 simone pernice
+## 
+## This program is free software; you can redistribute it and/or modify
+## it under the terms of the GNU General Public License as published by
+## the Free Software Foundation; either version 2 of the License, or
+## (at your option) any later version.
+## 
+## This program is distributed in the hope that it will be useful,
+## but WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+## GNU General Public License for more details.
+## 
+## You should have received a copy of the GNU General Public License
+## along with this program; if not, write to the Free Software
+## Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+
+## __intersectSingleInt__ compute the intersection among two intervals
+
+## Author: simone pernice
+## Created: 2008-08-18
+
+function ret = __intersectSingleInt__ (i1, i2)
+  i1 = __checkInt__ (i1);
+  i2 = __checkInt__ (i2);
+  if (i1(1) > i2(2) || i1(2) < i2(2))
+    ret = [0, 0];
+    return;
+  endif
+  join = [i1, i2];
+  ret = zeros (1, 2);
+  ret (0) = min (join);
+  ret (1) = max (join);
+endfunction