Mercurial > octave-libgccjit
view scripts/linear-algebra/isdiag.m @ 18904:9addb5ad9426
bandwidth.m: Add new function.
* NEWS: Announce new function.
* scripts/linear-algebra/module.mk: New function added to the build system.
* scripts/help/__unimplemented__.m: New function removed from unimplemented.
* scripts/linear-algebra/isbanded.m: New function added as documentation reference.
* scripts/linear-algebra/isdiag.m: New function added as documentation reference.
* scripts/linear-algebra/istril.m: New function added as documentation reference.
* scripts/linear-algebra/istriu.m: New function added as documentation reference.
* scripts/linear-algebra/bandwidth.m: New function.
* linalg.txi: Add bandwidth function to manual.
author | Massimiliano Fasi <massimiliano.fasi@gmail.com> |
---|---|
date | Tue, 08 Jul 2014 12:19:37 +0200 |
parents | 49961d67e4b9 |
children | d0d0858cfab1 |
line wrap: on
line source
## Copyright (C) 2014 Massimiliano Fasi ## ## 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 ## <http://www.gnu.org/licenses/>. ## -*- texinfo -*- ## @deftypefn {Function File} {} isdiag (@var{x}) ## Return true if @var{x} is a diagonal matrix. ## @seealso{isbanded, istril, istriu, diag, bandwidth} ## @end deftypefn ## Author: Massimiliano Fasi function retval = isdiag (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 (! isdiag ("string")) %!assert (isdiag ([])) %!assert (isdiag (1)) %!assert (! isdiag ([1, 1])) %!assert (! isdiag ([1; 1])) %!assert (isdiag (eye (10))) %!assert (issymmetric ([i, 0; 0, 1 + i])) %!assert (isdiag (speye (1000000))) %!assert (isdiag (logical (eye (10)))) %% Test input validation %!error isdiag () %!error isdiag (1,2)