refactoring

fitlog.m
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			%
			% @file fitlog.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 [yfit, P] = fitlog(x,y)
			P=polyfit(log(x),log(y),1);
			yfit = exp(P(2)).*x.^P(1);