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+## Copyright (C) 2005 Paul Kienzle <pkienzle@users.sf.net>
+##
+## 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 2, 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, write to the Free
+## Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+## 02110-1301, USA.
+
+## -*- texinfo -*-
+## @deftypefn {Function File} {} fplot (@var{fn}, @var{limits})
+## @deftypefnx {Function File} {} fplot (@var{fn}, @var{limits}, @var{n})
+## Plots a function @var{fn}, within the defined limits. @var{fn}
+## an be either a string, a function handle or an inline function.
+## The limits of the plot are given by @var{limits} of the form
+## @code{[@var{xlo}, @var{xhi}]} or @code{[@var{xlo}, @var{xhi},
+## @var{ylo}, @var{yhi}]}. @var{n} is the number of points to use and
+## defaults to 100. 
+##
+## @example
+##    fplot('cos',[0,2*pi])
+##    fplot('[cos(x),sin(x)]',[0,2*pi])
+## @end example
+## @end deftypefn
+
+function fplot (fn, limits, n)
+  if (nargin < 2 || nargin > 3)
+    usage ("fplot (fn, limits, n)");
+  endif
+
+  if (nargin < 3) 
+    n = 100; 
+  endif
+
+  x = linspace (limits(1), limits(2), n)';
+
+  if (strcmp (class (fn), "inline function")
+      || strcmp (class (fn), "function handle"))
+    y = fn (x);
+  elseif (all (isalnum (fn)))
+    y = feval (fn, x);
+  else
+    finl = inline (fn);
+    y = finl (x);
+  endif
+
+  if (length (limits) > 2) 
+    axis (limits);
+  endif
+
+  plot (x, y, [";", fn, ";"]);
+
+endfunction