funStyblinskiTang

PURPOSE ^

% Styblinski Tang function

SYNOPSIS ^

function [p,dp]=funStyblinskiTang(xx)

DESCRIPTION ^

% Styblinski Tang function
L. LAURENT -- 23/03/2017 -- luc.laurent@lecnam.net

CROSS-REFERENCE INFORMATION ^

This function calls: This function is called by:

SOURCE CODE ^

0001 %% Styblinski Tang function
0002 %L. LAURENT -- 23/03/2017 -- luc.laurent@lecnam.net
0003 
0004 % sources available here:
0005 % https://bitbucket.org/luclaurent/optigtest/
0006 % https://github.com/luclaurent/optigtest/
0007 
0008 % optiGTest - set of testing functions    A toolbox to easy manipulate functions.
0009 % Copyright (C) 2017  Luc LAURENT <luc.laurent@lecnam.net>
0010 %
0011 % This program is free software: you can redistribute it and/or modify
0012 % it under the terms of the GNU General Public License as published by
0013 % the Free Software Foundation, either version 3 of the License, or
0014 % (at your option) any later version.
0015 %
0016 % This program is distributed in the hope that it will be useful,
0017 % but WITHOUT ANY WARRANTY; without even the implied warranty of
0018 % MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
0019 % GNU General Public License for more details.
0020 %
0021 % You should have received a copy of the GNU General Public License
0022 % along with this program.  If not, see <http://www.gnu.org/licenses/>.
0023 
0024 %
0025 %global minimum : f(x)=-39.16616570377142*nbvar for xi=-1.903534018185960
0026 %
0027 %Design space: -5<xi<5
0028 %
0029 
0030 function [p,dp]=funStyblinskiTang(xx)
0031 %constants
0032 a=16;
0033 b=5;
0034 
0035 %evaluation and derivatives
0036 pa=xx.^4-a*xx.^2+b*xx;
0037 %
0038 p=sum(pa*1/2,3);
0039 %
0040 if nargout==2
0041     %
0042     dp=1/2.*(4*xx.^3-2*a*xx+b);
0043 end

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