refactoring

cds_mat.m
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			%
			% @file cds_mat.m
			%
			% @brief
			%
			% @copyright
			% Copyright (©) 2021 EPFL (Ecole Polytechnique Fédérale de Lausanne)
			% SPC (Swiss Plasma Center)
			%
			% spclibs is free software: you can redistribute it and/or modify it under
			% the terms of the GNU Lesser General Public License as published by the Free
			% Software Foundation, either version 3 of the License, or (at your option)
			% any later version.
			%
			% spclibs 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 Lesser General Public License
			% along with this program. If not, see <https://www.gnu.org/licenses/>.
			%
			% @authors
			% (in alphabetical order)
			% @author Trach-Minh Tran <trach-minh.tran@epfl.ch>
			%
			function [mata, diag] = cds_mat(file, dset)
			n=double(hdf5read(file,dset, 'RANK'));
			dists=double(hdf5read(file, strcat(dset,'/dists')));
			val=hdf5read(file, strcat(dset,'/vals'));

			%% Shift the off-diagonals %%
			for k=1:length(dists)
			d=dists(k);
			if d < 0
			val(1:n+d,k) = val(1-d:n,k);
			elseif d > 0
			val(n:-1:d+1,k) = val(n-d:-1:1,k);
			end
			end
			mata = spdiags(val, dists, n,n);
			if nargout == 2
			idiag = find(dists==0);
			diag = val(:,idiag);
			end