--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main/struct/isfield.m	Wed Oct 10 19:54:49 2001 +0000
@@ -0,0 +1,37 @@
+## Copyright (C) 2000  Etienne Grossman
+##
+## 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+##       y = isfield(x,k)
+##
+## Returns 1 if x is a struct and k a string, and x.k exists.
+## Returns 0 otherwise. 
+##
+## For m****b compat and flexibility.
+##
+## See also cmpstruct, fields, setfield, rmfield, getfield, isstruct,
+## struct. 
+
+## Author:        Etienne Grossmann  <etienne@isr.ist.utl.pt>
+## Last modified: January 2000
+
+function y = isfield(x,k)
+  if is_struct(x)
+    y = struct_contains (x, k);  
+    ## eval(sprintf('x.%s;y=1;',k),'y=0;');
+  else
+    y = 0 ;
+  end
+end
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