--- a
+++ b/inst/valtol100ToInt.m
@@ -0,0 +1,30 @@
+## 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
+
+## valtol100ToInt return an interval given a value with its tolerance expressed in percentage (optionally also a negative tolerance). I.E. 10+-5% is tolToInt (10, 5); 10+20%-5% is tolToInt (10,20,-5).
+
+## Author: simone pernice
+## Created: 2008-08-18
+
+function interval = valtol100ToInt (val, ptol, mtol = - ptol)
+  if (nargin() != 2 && nargin() != 3) 
+	  error("Wrong number of argument passed to the function");
+  endif
+  interval = [val, val];
+  interval(1) += val * mtol / 100;
+  interval(2) += val * ptol / 100;
+  interval = __checkInt__ (interval);
+endfunction