funRotatedEllipse1

PURPOSE ^

% Rotated Ellipse function 1

SYNOPSIS ^

function [p,dp] = funRotatedEllipse1(xx)

DESCRIPTION ^

% Rotated Ellipse function 1
 L. LAURENT -- 14/02/2017 -- luc.laurent@lecnam.net

CROSS-REFERENCE INFORMATION ^

This function calls: This function is called by:

SOURCE CODE ^

0001 %% Rotated Ellipse function 1
0002 % L. LAURENT -- 14/02/2017 -- 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 %1 minimum global: f(0,0)=0
0025 %
0026 %Design space -500<xi<500
0027 
0028 
0029 function [p,dp] = funRotatedEllipse1(xx)
0030 
0031 
0032 %evaluation and derivatives
0033 p=xx(:,:,1).^2-xx(:,:,1).*xx(:,:,2)+xx(:,:,2).^2;
0034 
0035 
0036 if nargout==2
0037     %
0038     dp=zeros(size(xx));
0039     dp(:,:,1)=2*xx(:,:,1)-xx(:,:,2);
0040     dp(:,:,2)=-xx(:,:,1)+2*xx(:,:,2);
0041 end
0042 end

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