funMatyas

PURPOSE ^

% Matyas's function

SYNOPSIS ^

function [p,dp]=funMatyas(xx)

DESCRIPTION ^

% Matyas's function
L. LAURENT -- 17/11/2016 -- luc.laurent@lecnam.net

CROSS-REFERENCE INFORMATION ^

This function calls: This function is called by:

SOURCE CODE ^

0001 %% Matyas's function
0002 %L. LAURENT -- 17/11/2016 -- 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(x1,x2)=0 for (x1,x2)=(0,0)
0026 %
0027 %Design space: -10<xi<10
0028 
0029 
0030 function [p,dp]=funMatyas(xx)
0031 %constants
0032 a=0.26;
0033 b=0.48;
0034 
0035 %variables
0036 xxx=xx(:,:,1);
0037 yyy=xx(:,:,2);
0038 
0039 %evaluation and derivatives
0040 p=a*(xxx.^2+yyy.^2)-b*xxx.*yyy;
0041 
0042 if nargout==2
0043     dp(:,:,1)=2*a*xxx-b*yyy;
0044     dp(:,:,2)=2*a*yyy-b*xxx;
0045 end
0046 end

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