update packages

[CreaPhase.git] / octave_packages / m / specfun / lcm.m

diff --git a/octave_packages/m/specfun/lcm.m b/octave_packages/m/specfun/lcm.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  {Mapping Function} {} lcm (@var{x}, @var{y})
+## @deftypefnx {Mapping Function} {} lcm (@var{x}, @var{y}, @dots{})
+## Compute the least common multiple of @var{x} and @var{y},
+## or of the list of all arguments.  All elements must be the same size or
+## scalar.
+## @seealso{factor, gcd}
+## @end deftypefn
+
+## Author: KH <Kurt.Hornik@wu-wien.ac.at>
+## Created: 16 September 1994
+## Adapted-By: jwe
+
+function l = lcm (varargin)
+
+  if (nargin > 1)
+    if (common_size (varargin{:}) != 0)
+      error ("lcm: all args must be of the same size or scalar");
+    elseif (! all (cellfun ("isnumeric", varargin)))
+      error ("lcm: all arguments must be numeric");
+    endif
+
+    l = varargin{1};
+    for i = 2:nargin
+      x = varargin{i};
+      msk = l == 0 & x == 0;
+      l .*= x ./ gcd (l, x);
+      l(msk) = 0;
+    endfor
+  else
+    print_usage ();
+  endif
+
+endfunction
+
+%!assert(lcm (3, 5, 7, 15) == 105);
+
+%!error lcm ();
+
+%!test
+%! s.a = 1;
+%! fail("lcm (s)");
+