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is_abcd.m
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1999-12-24
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## Copyright (C) 1997 Kai P. Mueller
##
## 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, 59 Temple Place, Suite 330, Boston, MA 02111 USA.
## -*- texinfo -*-
## @deftypefn {Function File } { @var{retval} =} is_abcd( @var{a}@{, @var{b}, @var{c}, @var{d}@})
## Returns @var{retval} = 1 if the dimensions of @var{a}, @var{b}, @var{c}, @var{d}
## are compatible, otherwise @var{retval} = 0 with an appropriate diagnostic
## message printed to the screen. The matrices b, c, or d may be omitted.
## @end deftypefn
## See also: abcddim
function retval = is_abcd (a, b, c, d)
## Written by Kai P. Mueller November 4, 1997
## based on is_contr.m of Scottedward Hodel
## modified by
retval = 0;
switch (nargin)
case (1)
## A only
[na, ma] = size(a);
if (na != ma)
disp("Matrix A ist not square.")
endif
case (2)
## A, B only
[na, ma] = size(a); [nb, mb] = size(b);
if (na != ma)
disp("Matrix A ist not square.")
return;
endif
if (na != nb)
disp("A and B column dimension different.")
return;
endif
case (3)
## A, B, C only
[na, ma] = size(a); [nb, mb] = size(b); [nc, mc] = size(c);
if (na != ma)
disp("Matrix A ist not square.")
return;
endif
if (na != nb)
disp("A and B column dimensions not compatible.")
return;
endif
if (ma != mc)
disp("A and C row dimensions not compatible.")
return;
endif
case (4)
## all matrices A, B, C, D
[na, ma] = size(a); [nb, mb] = size(b);
[nc, mc] = size(c); [nd, md] = size(d);
if (na != ma)
disp("Matrix A ist not square.")
return;
endif
if (na != nb)
disp("A and B column dimensions not compatible.")
return;
endif
if (ma != mc)
disp("A and C row dimensions not compatible.")
return;
endif
if (mb != md)
disp("B and D row dimensions not compatible.")
return;
endif
if (nc != nd)
disp("C and D column dimensions not compatible.")
return;
endif
otherwise
usage("retval = is_abcd(a [, b, c, d])")
endswitch
## all tests passed, signal ok.
retval = 1;
endfunction