Mercurial > octave
view scripts/linear-algebra/isdiag.m @ 31706:597f3ee61a48 stable
update Octave Project Developers copyright for the new year
author | John W. Eaton <jwe@octave.org> |
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date | Fri, 06 Jan 2023 13:11:27 -0500 |
parents | 83f9f8bda883 |
children | 2e484f9f1f18 |
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######################################################################## ## ## Copyright (C) 2014-2023 The Octave Project Developers ## ## See the file COPYRIGHT.md in the top-level directory of this ## distribution or <https://octave.org/copyright/>. ## ## 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 ## <https://www.gnu.org/licenses/>. ## ######################################################################## ## -*- texinfo -*- ## @deftypefn {} {@var{tf} =} isdiag (@var{A}) ## Return true if @var{A} is a diagonal matrix. ## @seealso{isbanded, istril, istriu, diag, bandwidth} ## @end deftypefn function tf = isdiag (A) if (nargin < 1) print_usage (); endif if (strfind (typeinfo (A), "diagonal matrix")) tf = true; elseif ((isnumeric (A) || islogical (A)) && ndims (A) == 2) [i, j] = find (A); tf = all (i == j); else tf = false; endif endfunction %!assert (isdiag ("string"), false) %!assert (isdiag (zeros (2,2,2)), false) %!assert (isdiag (zeros (2))) %!assert (isdiag ([])) %!assert (isdiag (1)) %!assert (isdiag ([1, 1]), false) %!assert (isdiag ([1; 1]), false) %!assert (isdiag (eye (10))) %!assert (isdiag (single (eye (10)))) %!assert (isdiag (logical (eye (10)))) %!assert (isdiag (speye (1e2))) %!assert (isdiag (diag (1:10))) ## Test input validation %!error <Invalid call> isdiag ()