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diff --git a/octave_packages/m/deprecated/gammai.m b/octave_packages/m/deprecated/gammai.m
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+## Copyright (C) 1994-2012 John W. Eaton
+##
+## This file is part of Octave.
+##
+## Octave 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 3 of the License, or (at
+## your option) any later version.
+##
+## Octave 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 Octave; see the file COPYING.  If not, see
+## <http://www.gnu.org/licenses/>.
+
+## -*- texinfo -*-
+## @deftypefn {Function File} {} gammai (@var{a}, @var{x})
+## This function is provided for compatibility with older versions of
+## Octave.  New programs should use @code{gammainc} instead.
+##
+## @code{gammai (@var{a}, @var{x})} is the same as
+## @code{gammainc (@var{x}, @var{a})}.
+## @end deftypefn
+
+## Author: jwe
+## Created: 30 Jan 1998
+
+## Deprecated in version 3.4
+
+function retval = gammai (a, x)
+  persistent warned = false;
+  if (! warned)
+    warned = true;
+    warning ("Octave:deprecated-function",
+             "gammai is obsolete and will be removed from a future version of Octave; please use gammainc instead");
+  endif
+
+  if (nargin == 2)
+    retval = gammainc (x, a);
+  else
+    print_usage ();
+  endif
+
+endfunction