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diff --git a/octave_packages/m/deprecated/krylovb.m b/octave_packages/m/deprecated/krylovb.m
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+## Copyright (C) 1993-2012 A. Scottedward Hodel
+##
+## 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} {[@var{u}, @var{ucols}] =} krylovb (@var{A}, @var{V}, @var{k}, @var{eps1}, @var{pflg})
+## See @code{krylov}.
+## @end deftypefn
+
+## Deprecated in version 3.4
+
+function [Uret, Ucols] = krylovb (A, V, k, eps1, pflg)
+
+  persistent warned = false;
+  if (! warned)
+    warned = true;
+    warning ("Octave:deprecated-function",
+             "krylovb is obsolete and will be removed from a future version of Octave; please use [Uret, ~, Ucols] = krylov (...) instead");
+  endif
+
+  switch (nargin)
+    case (3)
+      [Uret, H, Ucols] = krylov (A, V, k);
+    case (4)
+      [Uret, H, Ucols] = krylov (A, V, k, eps1);
+    case (5)
+      [Uret, H, Ucols] = krylov (A, V, k, eps1, pflg);
+    otherwise
+      print_usage ();
+  endswitch
+
+endfunction