--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/scripts/linear-algebra/logm.m	Wed Feb 19 06:25:09 2003 +0000
@@ -0,0 +1,36 @@
+## Copyright (C) 2003 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 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 this program; see the file COPYING.  If not, write to the
+## Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
+## 02111-1307, USA.
+
+## -*- texinfo -*-
+## @deftypefn {Function File} {} logm (@var{a})
+## Compute the matrix logarithm of the square matrix @var{a}.  Note that
+## this is currently implemented in terms of an eigenvalue expansion and
+## needs to be improved to be more robust.
+## @end deftypefn
+
+function B = logm (A)
+
+  if (nargin != 1)
+    usage ("B = logm (A)");
+  endif
+
+  [V, D] = eig (A);
+  B = V * diag (log (diag (D))) * inv (V);
+
+endfunction