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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
-