Mercurial > octave
view scripts/linear-algebra/istril.m @ 29358:0a5b15007766 stable
update Octave Project Developers copyright for the new year
In files that have the "Octave Project Developers" copyright notice,
update for 2021.
author | John W. Eaton <jwe@octave.org> |
---|---|
date | Wed, 10 Feb 2021 09:52:15 -0500 |
parents | a4268efb7334 |
children | 7854d5752dd2 |
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######################################################################## ## ## Copyright (C) 2014-2021 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 {} {} istril (@var{A}) ## Return true if @var{A} is a lower triangular matrix. ## ## A lower triangular matrix has nonzero entries only on the main diagonal and ## below. ## @seealso{istriu, isbanded, isdiag, tril, bandwidth} ## @end deftypefn function retval = istril (A) if (nargin != 1) print_usage (); endif retval = (isnumeric (A) || islogical (A)) && ndims (A) == 2; if (retval) [i, j] = find (A); retval = all (i >= j); endif endfunction %!assert (! istril ("string")) %!assert (istril ([])) %!assert (! istril (zeros (2,2,2))) %!assert (istril (1)) %!assert (! istril ([1, 1])) %!assert (istril ([1; 1])) %!assert (istril (eye (10))) %!assert (istril (speye (100))) %!assert (istril (tril (randn (10)))) %!assert (! istril (randn (10))) ## Test input validation %!error istril () %!error istril (1,2)