Mercurial > octave-libtiff
view scripts/general/blkdiag.m @ 31185:a1145ac2ce9b
Tiff: populated TagID from the C++ map to avoid having two copies
* __tiff__.cc (F__tiff_make_tagid__): implemented internal function as
initializer for TagID.
* Tiff.m: changed the initialization for TagID to use the internal function.
author | magedrifaat <magedrifaat@gmail.com> |
---|---|
date | Thu, 18 Aug 2022 17:23:43 +0200 |
parents | 5d3faba0342e |
children |
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######################################################################## ## ## Copyright (C) 2000-2022 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{M} =} blkdiag (@var{A}, @var{B}, @var{C}, @dots{}) ## Build a block diagonal matrix from @var{A}, @var{B}, @var{C}, @dots{} ## ## All arguments must be numeric and either two-dimensional matrices or ## scalars. If any argument is of type sparse, the output will also be sparse. ## @seealso{diag, horzcat, vertcat, sparse} ## @end deftypefn function M = blkdiag (varargin) if (nargin < 1) print_usage (); endif if (! all (cellfun ("isnumeric", varargin))) error ("blkdiag: all arguments must be numeric"); endif ## Note: trailing singletons are automatically (correctly) ignored. if (! all (cellfun ("ndims", varargin) == 2)) error ("blkdiag: all arguments must be two-dimensional matrices"); endif ## size is an option for cellfun, but it's a bit different from ## calling size directly. tmp = cell2mat (cellfun (@size, varargin', "uniformoutput", false)); csz = cumsum ([0 0; tmp], 1); if (any (cellfun ("issparse", varargin))) M = sparse (csz(end,1), csz(end,2)); else M = zeros (csz(end,:)); endif for p = 1:nargin vp = varargin{p}; if (! isempty (vp)) M((csz(p,1)+1):csz(p+1,1),(csz(p,2)+1):csz(p+1,2)) = vp; endif endfor endfunction ## regular tests %!assert (blkdiag (1,ones (2),1), [1,0,0,0;0,1,1,0;0,1,1,0;0,0,0,1]) %!assert (blkdiag ([1,2],[3,4],[5,6]), [1,2,0,0,0,0;0,0,3,4,0,0;0,0,0,0,5,6]) %!assert (blkdiag ([1,2],[3;4],[5,6]), %! [1,2,0,0,0;0,0,3,0,0;0,0,4,0,0;0,0,0,5,6]) %!assert (blkdiag ([1,2;3,4],[5,6,7]), [1,2,0,0,0;3,4,0,0,0;0,0,5,6,7]) ## tests involving empty matrices %!assert (blkdiag ([],[],[]), []) %!assert (blkdiag ([],[1,2;3,4],[],5,[]), [1,2,0;3,4,0;0,0,5]) %!assert (blkdiag (zeros (1,0,1),[1,2,3],1,0,5,zeros (0,1,1)), %! [0,0,0,0,0,0,0;1,2,3,0,0,0,0;0,0,0,1,0,0,0;0,0,0,0,0,0,0;0,0,0,0,0,5,0]) ## tests involving sparse matrices %!assert (blkdiag (sparse ([1,2;3,4]),[5,6;7,8]), %! sparse ([1,2,0,0;3,4,0,0;0,0,5,6;0,0,7,8])) %!assert (blkdiag (sparse ([1,2;3,4]),[5,6]), %! sparse ([1,2,0,0;3,4,0,0;0,0,5,6])) ## sanity checks %!test %! A = rand (round (rand (1, 2) * 10)); %! assert (blkdiag (A), A);