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+## Copyright (C) 2012 Daniel Kraft
+##
+## 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  {Command} {} profile on
+## @deftypefnx {Command} {} profile off
+## @deftypefnx {Command} {} profile resume
+## @deftypefnx {Command} {} profile clear
+## @deftypefnx {Function File} {@var{S} =} profile ('status')
+## @deftypefnx {Function File} {@var{T} =} profile ('info')
+## Control the built-in profiler.
+##
+## @table @code
+## @item profile on
+## Start the profiler, clearing all previously collected data if there
+## is any.
+##
+## @item profile off
+## Stop profiling.  The collected data can later be retrieved and examined
+## with calls like @code{S = profile ('info')}.
+##
+## @item profile clear
+## Clear all collected profiler data.
+##
+## @item profile resume
+## Restart profiling without cleaning up the old data and instead
+## all newly collected statistics are added to the already existing ones.
+##
+## @item @var{S} = profile ('status')
+## Return a structure filled with certain information about the current status
+## of the profiler.  At the moment, the only field is @code{ProfilerStatus}
+## which is either 'on' or 'off'.
+##
+## @item @var{T} = profile ('info')
+## Return the collected profiling statistics in the structure @var{T}.
+## The flat profile is returned in the field @code{FunctionTable} which is an
+## array of structures, each entry corresponding to a function which was called
+## and for which profiling statistics are present.  Furthermore, the field
+## @code{Hierarchical} contains the hierarchical call-tree.  Each node
+## has an index into the @code{FunctionTable} identifying the function it
+## corresponds to as well as data fields for number of calls and time spent
+## at this level in the call-tree.
+## @seealso{profshow, profexplore}
+## @end table
+## @end deftypefn
+
+## Built-in profiler.
+## Author: Daniel Kraft <d@domob.eu>
+
+function retval = profile (option)
+
+  if (nargin != 1)
+    print_usage ();
+  endif
+
+  switch (option)
+    case 'on'
+      __profiler_reset__ ();
+      __profiler_enable__ (true);
+
+    case 'off'
+      __profiler_enable__ (false);
+
+    case 'clear'
+      __profiler_reset__ ();
+
+    case 'resume'
+      __profiler_enable__ (true);
+
+    case 'status'
+      enabled = __profiler_enable__ ();
+      if (enabled)
+        enabled = 'on';
+      else
+        enabled = 'off';
+      endif
+      retval = struct ('ProfilerStatus', enabled);
+
+    case 'info'
+      [flat, tree] = __profiler_data__ ();
+      retval = struct ('FunctionTable', flat, 'Hierarchical', tree);
+
+    otherwise
+      warning ("profile: Unrecognized option '%s'", option);
+      print_usage ();
+
+  endswitch
+
+endfunction
+
+
+%!demo
+%! profile ('on');
+%! A = rand (100);
+%! B = expm (A);
+%! profile ('off');
+%! profile ('resume');
+%! C = sqrtm (A);
+%! profile ('off');
+%! T = profile ('info');
+%! profshow (T);
+
+%!error profile ();
+%!error profile ('on', 2);
+
+%!test
+%! on_struct.ProfilerStatus = "on";
+%! off_struct.ProfilerStatus = "off";
+%! profile ('on');
+%! result = logm (rand (200) + 10 * eye (200));
+%! assert (profile ('status'), on_struct);
+%! profile ('off');
+%! assert (profile ('status'), off_struct);
+%! profile ('resume');
+%! result = logm (rand (200) + 10 * eye (200));
+%! profile ('off');
+%! assert (profile ('status'), off_struct);
+%! info = profile ('info');
+%! assert (isstruct (info));
+%! assert (size (info), [1, 1]);
+%! assert (fieldnames (info), {'FunctionTable'; 'Hierarchical'});
+%! ftbl = info.FunctionTable;
+%! assert (fieldnames (ftbl), {'FunctionName'; 'TotalTime'; 'NumCalls'; 'IsRecursive'; 'Parents'; 'Children'});
+%! hier = info.Hierarchical;
+%! assert (fieldnames (hier), {'Index'; 'SelfTime'; 'TotalTime'; 'NumCalls'; 'Children'});
+%! profile ('clear');
+%! info = profile ('info');
+%! assert (isstruct (info));
+%! assert (size (info), [1, 1]);
+%! assert (fieldnames (info), {'FunctionTable'; 'Hierarchical'});
+%! ftbl = info.FunctionTable;
+%! assert (size (ftbl), [0, 1]);
+%! assert (fieldnames (ftbl), {'FunctionName'; 'TotalTime'; 'NumCalls'; 'IsRecursive'; 'Parents'; 'Children'});
+%! hier = info.Hierarchical;
+%! assert (size (hier), [0, 1]);
+%! assert (fieldnames (hier), {'Index'; 'SelfTime'; 'NumCalls'; 'Children'});