Why does 'paretosearch' function show an error here?

2 次查看（过去 30 天）
kefeng sens
kefeng sens 2022-1-26
编辑： ag 2024-1-9
I am getting an error : Unrecognized field name "nArchiveSize" , and I do not know how to fix it.
The 'optimoptions' is from plot-3-d-pareto-set.
'N3(x)' and 'N4(x)' are familer with 'N2(x)'.
function fa = N2(x)
u0=4*pi*1e-7;
eps0=1e-9/(36*pi);
fre = 0.9e9;
w = 2*pi*fre;
lamda = 3e8/fre;
k0 = w*sqrt(eps0*u0);
gamma1 = 0.63117783 - 1i*0.043092759;
gamma2 = gamma1*exp(2*1i*k0*lamda/4);
Zin1 = 376.99*(1 + gamma2)/(1 - gamma2);
x(:,6)=0;
d1 = x(:,1);
d2 = x(:,2);
d3 = x(:,3);
eps_r1 = x(:,4);
eps_r2 = x(:,5);
eps_r3 = x(:,6);
eps1 = eps_r1.*eps0;
eps2 = eps_r2.*eps0;
eps3 = eps_r3.*eps0;
k1 = w.*sqrt(eps1.*u0);
k2 = w.*sqrt(eps2.*u0);
k3 = w.*sqrt(eps3.*u0);
Z01 = sqrt(u0./eps1);
Z02 = sqrt(u0./eps2);
Z03 = sqrt(u0./eps3);
Zin2 = Z01.*(Zin1 + 1i.*Z01.*tan(k1.*d1))./(Z01 + 1i.*Zin1.*tan(k1.*d1));
Zin3 = Z02.*(Zin2 + 1i.*Z02.*tan(k2.*d2))./(Z02 + 1i.*Zin2.*tan(k2.*d2));
Zin4 = Z03.*(Zin3 + 1i.*Z03.*tan(k3.*d3))./(Z03 + 1i.*Zin3.*tan(k3.*d3));
gamma3 = (Zin4-377)./(Zin4+377);
aa = abs(imag(gamma3));
bb = abs(real(gamma3));
fa = aa+bb;
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
function F=fun(~)
F(1) = N2;
F(2) = N3;
F(3) = N4;
end
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
clear
clc
fitnessfcn=@fun;
nvars=6;
lb=[0 0 0 1 1 1];
ub=[0.02 0.02 0.02 50 50 50];
A = [];
b = [];
Aeq=[];
beq=[];
options = optimoptions('paretosearch','UseVectorized',true,'ParetoSetSize',1,'PlotFcn','psplotparetof');
rng default
[x,fval]=paretosearch(fitnessfcn,nvars,A,b,Aeq,beq,lb,ub,[],options);

请先登录，再回答此问题。

回答（1 个）

ag
ag 2024-1-9
编辑：ag 2024-1-9
Hi Kefeng,
I understand that you are facing the error "Unrecognized field name: nArchiveSize" while using the "paretosearch" function.
Upon debugging your code, I found that the objective function "N2", returns "NaN" value, which causes the function "initialize"(called through "paretosearch") to exit early, without initializing all the required variables. Therreafter, when the "nArchiveSize" is being accessed inside "driver"(called through "paretosearch"), which was never initialized, it throws the error.
The below lines from the function "N2", are producing "NaN" values, because of the "divide by zero" problem.
Z01 = sqrt(u0./eps1);
Z02 = sqrt(u0./eps2);
Z03 = sqrt(u0./eps3);
Zin2 = Z01.*(Zin1 + 1i.*Z01.*tan(k1.*d1))./(Z01 + 1i.*Zin1.*tan(k1.*d1));
Zin3 = Z02.*(Zin2 + 1i.*Z02.*tan(k2.*d2))./(Z02 + 1i.*Zin2.*tan(k2.*d2));
Zin4 = Z03.*(Zin3 + 1i.*Z03.*tan(k3.*d3))./(Z03 + 1i.*Zin3.*tan(k3.*d3));
To fix this, modify the logic for "N2", to get rid of the "divide by zero" scenario.
Please refer to the following documentation, for more details on creating an objective function:
https://www.mathworks.com/help/gads/computing-objective-functions.html
Hope this helps!
Best Regards,
Aryan Gupta

类别

在 Help Center 和 File Exchange 中查找有关 Multiobjective Optimization 的更多信息

标签

产品


版本

R2021b

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by