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## Copyright (C) 1994-2015 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 numeric and of the same size or scalar.
## @seealso{factor, gcd, isprime}
## @end deftypefn
## Author: KH <Kurt.Hornik@wu-wien.ac.at>
## Created: 16 September 1994
## Adapted-By: jwe
function l = lcm (varargin)
if (nargin < 2)
print_usage ();
endif
if (common_size (varargin{:}) != 0)
error ("lcm: all args must be 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
endfunction
%!assert (lcm (3, 5, 7, 15), 105)
%!error lcm ()
%!error lcm (1)
%!error <same size or scalar> lcm ([1 2], [1 2 3])
%!error <arguments must be numeric> lcm ([1 2], {1 2})
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