refactoring

csr_mat.m
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			%
			% @file csr_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] = csr_mat(file, dset)
			n=hdf5read(file,dset, 'RANK');
			nnz=hdf5read(file,dset, 'NNZ');
			cols=hdf5read(file, strcat(dset,'/cols'));
			irow=hdf5read(file, strcat(dset,'/irow'));
			val=hdf5read(file, strcat(dset,'/val'));
			idiag=hdf5read(file, strcat(dset,'/idiag'));
			for i=1:n
			s = irow(i);
			e = irow(i+1)-1;
			rows(s:e) = i;
			end
			cols=double(cols);
			rows=double(rows);
			vals = double(val);
			mata = sparse(rows,cols,vals);
			if nargout == 2
			diag = val(idiag);
			end