funGear

PURPOSE ^

% Gear function

SYNOPSIS ^

function [p,dp]=funGear(xx)

DESCRIPTION ^

% Gear function
L. LAURENT -- 16/03/2017 -- luc.laurent@lecnam.net

CROSS-REFERENCE INFORMATION ^

This function calls: This function is called by:

SOURCE CODE ^

0001 %% Gear function
0002 %L. LAURENT -- 16/03/2017 -- 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)=2.7e-12 for x=[16 19 43 49]
0026 %
0027 %Design space: 12<xi<60
0028 %
0029 
0030 
0031 
0032 function [p,dp]=funGear(xx)
0033 %constants
0034 a=1;
0035 b=6.931;
0036 
0037 %evaluation and derivatives
0038 x=xx(:,:,1);
0039 y=xx(:,:,2);
0040 z=xx(:,:,3);
0041 w=xx(:,:,4);
0042 %
0043 fx=floor(x);
0044 fy=floor(y);
0045 fz=floor(z);
0046 fw=floor(w);
0047 %
0048 p=(a/b-(fx.*fy)./(fw.*fz)).^2;
0049 
0050 %
0051 if nargout==2
0052     %
0053     dp=zeros(size(xx));
0054     %
0055     isInteger =@(input) (imag(input) == 0) & (round(input) == input);
0056     %
0057     dp(isInteger(xx))=1/eps;
0058 end
0059 end

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