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lcm.m
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1996-09-28
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# Copyright (C) 1995 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 Octave; see the file COPYING. If not, write to the Free
# Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
function l = lcm (a, ...)
# usage: lcm (a, ...)
#
# lcm (a) returns the least common multiple of the entries of the
# integer vector a.
# lcm (a1, ..., ak) is the same as lcm([a1, ..., ak]).
# Written by KH (Kurt.Hornik@ci.tuwien.ac.at) on Sep 16, 1994.
if (nargin > 1)
va_start;
for k = 2:nargin;
a = [a, va_arg ()];
endfor
endif
if (round (a) != a)
error ("lcm: all arguments must be integer");
endif
if (any (a) == 0)
l = 0;
else
a = abs (a);
l = a (1);
for k = 1:(length (a) - 1)
l = l * a(k+1) / gcd (l, a(k+1));
endfor
endif
endfunction