Mercurial > octave
view scripts/linear-algebra/istril.m @ 33029:0b8f3470d1fb stable
doc: Clarify object types for isX functions (bug #48088)
* libinterp/corefcn/data.cc (isscalar, isvector, isrow, iscolumn, ismatrix,
issquare): Change docstring to indicate the functions apply to arrays of any
type.
* libinterp/octave-value/ov-null-mat.cc (isnull): Replace matrix with array
in docstring.
* scripts/linear-algebra/isbanded.m, isdefinite.m, ishermitian.m,
issymmetric.m, istril, istriu: Note in docstrings that functions return true
for numeric matrices.
* scripts/linear-algebra/isdiag.m: Note in docstring that function returns
true for numeric matrices. Define meaning of diagonal.
author | Nicholas R. Jankowski <jankowski.nicholas@gmail.com> |
---|---|
date | Thu, 15 Feb 2024 21:42:27 -0500 |
parents | 2e484f9f1f18 |
children |
line wrap: on
line source
######################################################################## ## ## Copyright (C) 2014-2024 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} =} istril (@var{A}) ## Return true if @var{A} is a lower triangular numeric matrix. ## ## A lower triangular matrix has nonzero entries only on the main diagonal and ## below. ## @seealso{istriu, isbanded, isdiag, tril, bandwidth} ## @end deftypefn function tf = istril (A) if (nargin < 1) print_usage (); endif tf = (isnumeric (A) || islogical (A)) && ndims (A) == 2; if (tf) [i, j] = find (A); tf = 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 <Invalid call> istril ()