refactoring

gb_mat.m
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			%
			% @file gb_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] = gb_mat(file, dset)
			rank=h5readatt(file, dset, 'RANK');
			ku=h5readatt(file, dset, 'KU');
			kl=h5readatt(file, dset, 'KL');
			gbmat=h5read(file, dset);
			m=rank; n=rank;
			mata = zeros(m,n);
			for i=1:m
			jmin = max(1,i-kl);
			jmax = min(n,i+ku);
			for j=jmin:jmax
			ib = kl+ku+i-j+1;
			mata(i,j)=gbmat(ib,j);
			end
			end
			clear gbmat;