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## Copyright (C) 1995, 1996 Kurt Hornik
##
## This program 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.
##
## This program 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 file. If not, write to the Free Software Foundation,
## 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
## usage: [errorcode, y_1, ...] = common_size (x_1, ...)
##
## Determine if all input arguments are either scalar or of common
## size. In this case, errorcode is zero, and y_i is a matrix of the
## common size with all entries equal to x_i if this is a scalar or
## x_i otherwise.
##
## If the inputs cannot be brought to a common size, errorcode is 1, and
## y_i is x_i.
##
## For example,
##
## [errorcode, a, b] = common_size ([1 2; 3 4], 5)
##
## returns errorcode = 0, a = [1 2, 3 4], b = [5 5; 5 5].
##
## This is useful for implementing functions where arguments can either
## be scalars or of common size.
## Author: KH <Kurt.Hornik@ci.tuwien.ac.at>
## Created: 15 October 1994
## Adapted-By: jwe
function [errorcode, ...] = common_size (...)
if (nargin < 2)
error ("common_size: only makes sense if nargin >= 2");
endif
va_start ();
for k = 1 : nargin
s(k, :) = size (va_arg ());
endfor
m = max (s);
if (any (any ((s != 1)') & any ((s != ones (nargin, 1) * m)')))
errorcode = 1;
va_start ();
for k = 1 : nargin
vr_val (va_arg ());
endfor
else
errorcode = 0;
va_start ();
for k = 1 : nargin
if (prod (s(k, :)) == 1)
vr_val (va_arg () * ones (m));
else
vr_val (va_arg ());
endif
endfor
endif
endfunction
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.