Hi,
Can you share the code where you are using the function "lsqnonlin".
How to overcome this error while using lsqnonlin for curvefitting??
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Solver stopped prematurely.
fmincon stopped because it exceeded the function evaluation limit,
options.MaxFunctionEvaluations = 3.000000e+03.
Please help me to change maxfunctionevaluations to 10000.
2 个评论
回答（3 个）
Hassaan
2024-1-17
you can set various options including the maximum number of function evaluations using the optimoptions function. If you're reaching the function evaluation limit, you can increase it as follows:
% Create an options structure for fmincon where you set the MaxFunctionEvaluations to 10000
options = optimoptions('fmincon', 'MaxFunctionEvaluations', 10000);
% Then you pass these options to the fmincon function
% For example, if you were minimizing a function 'myFunction' starting at an initial point 'x0'
[x, fval, exitflag, output] = fmincon(@myFunction, x0, [], [], [], [], [], [], [], options);
In this code, replace @myFunction with the handle to your actual objective function and x0 with your actual initial point for the optimization. The rest of the parameters [] should be replaced with any constraints you have.
Make sure to include this options structure when you call fmincon. The solver will then use the specified limit for function evaluations.
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Mann Baidi
2024-1-17
Hi Anil,
As per my understanding of the question, you would like to change the "options.MaxFunctionEvaluations" from 3000 to 10000.
You can accomplish this using the below code:
% Assuming you have an existing options structure
options = optimoptions('fmincon')
% Set the 'MaxFunctionEvaluations' option to 10000
options.MaxFunctionEvaluations = 10000;
options
Hope this works!
0 个评论
Torsten
2024-1-17
编辑：Torsten
2024-1-17
clc
clear all
close all
warning off
%25wt.%
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ydata = [sm;lm;lf];
tdata = freq;
% scatter(freq,ydata);
fun = @(x)nlsqfun(x,tdata,ydata);
x0 = [1e-5,0.1,0.1,0.1,0,0,0,0,0.01];
% x0 = [7.1066e-08;0.5235;0.6678;0.0192;8.3181e+03;2.7365e+03;1.6327e+03;543.8365;0.1859];
% x0 = zeros(1,9);
A = [];
b = [];
Aeq = [];
beq = [];
lb = zeros(1,9);
ub = [0.01,1,1,1,inf,inf,inf,inf,1];
x = lsqnonlin(fun,x0,lb,ub,A,b,Aeq,beq)
E = fun(x);
%[tdata,idx] = sort(tdata);
%plot(tdata,E(idx),'o')
plot(tdata,E,'o')
function E = nlsqfun(x,tdata,ydata)
E0 = 3.73;
Tr = x(1); al = x(2); bta = x(3); g = x(4); p = x(9); l1 = x(5); l2 = x(6); l3 = x(7); o = x(8);
ER = (E0 + ((l1*(((tdata).*Tr).^(g+p)).*(cos(0.5*pi*(g+p)) + l2*cos(0.5*pi*p)*(((tdata).*Tr).^(g))))./(1+ l2*(((tdata).*Tr).^(g)).*(2*cos(0.5*pi*g) + l2*(((tdata).*Tr).^(g))))) + ((E0*o*(((tdata).*Tr).^(al+bta)).*(cos(0.5*pi*(al+bta)) + l3*cos(0.5*pi*bta)*(((tdata).*Tr).^(al)) + (((tdata).*Tr).^(al+bta))))./(1 + (((tdata).*Tr).^(al)).*(2*l3*cos(0.5*pi*al) + 2*cos(0.5*pi*(al+bta)*(((tdata).*Tr).^(bta))) + (((tdata).*Tr).^(al)).*(l3^2 + 2*l3*cos(0.5*pi*bta)*(((tdata).*Tr).^(bta)) + (((tdata).*Tr).^(2*bta)))))));
EI = (((l1.*(((tdata).*Tr).^(g+p)).*(sin(0.5*pi*(g+p)) + l2*sin(0.5*pi*p)).*(((tdata).*Tr).^(g)))./(1 + l2*(((tdata).*Tr).^(g)).*(2*cos(0.5*pi*g) + l2*(((tdata).*Tr).^(g))))) + ((E0*o*(((tdata).*Tr).^(al+bta)).*(sin(0.5*pi*(al+bta)) + l3*sin(0.5*pi*bta)*(((tdata).*Tr).^(al))))./(1 + (((tdata).*Tr).^(al)).*(2*l3*cos(0.5*pi*al) + 2*cos(0.5*pi*(al+bta))*(((tdata).*Tr).^(bta)) + (((tdata).*Tr).^(al)).*(l3^2 + 2*l3*cos(0.5*pi*bta).*(((tdata).*Tr).^(bta)) + (((tdata).*Tr).^(2*bta)))))));
% gs = ((E0*o*(((tdata).*Tr).^(al+bta)).*(sin(0.5*pi*(al+bta)) + l3*sin(0.5*pi*bta)*(((tdata).*Tr).^(al))).*(1 + l2*(((tdata).*Tr).^(g)).*(2*cos(0.5*pi*g) + l2*(((tdata).*Tr).^(g)))) + l1*(((tdata).*Tr).^(g+p)).*(sin(0.5*pi*(g+p)) + l2*sin(0.5*pi*p)*(((tdata).*Tr).^(g))).*(1 + (((tdata).*Tr).^(al)).*(2*l3*cos(0.5*pi*al) + 2*cos(0.5*pi*(al+bta))*(((tdata).*Tr).^(bta))) + (((tdata).*Tr).^(2*al)).*(l3^2 + 2*l3*cos(0.5*pi*bta).*(((tdata).*Tr).^(bta)) + (((tdata).*Tr).^(2*bta)))))./(E0*(1 + l2*(((tdata).*Tr).^(g)).*(2*cos(0.5*pi*g) + l2*(((tdata).*Tr).^(g)))).*(1 + (1+o)*(((tdata).*Tr).^(2*al + 2*bta)) + l3*(((tdata).*Tr).^(al)).*(2*cos(0.5*pi*al) + l3*(((tdata).*Tr).^(al))) + (2+o)*(((tdata).*Tr).^(al+bta)).*(cos(0.5*pi*(al+bta)) + l3*cos(0.5*pi*bta)*(((tdata).*Tr).^(al)))) + l1*(((tdata).*Tr).^(g+p)).*(cos(0.5*pi*(g+p)) + l2*cos(0.5*pi*p)*(((tdata).*Tr).^(g))).*(1 + 2*l3*cos(0.5*pi*al)*(((tdata).*Tr).^(al)) + 2*cos(0.5*pi*(al+bta))*(((tdata).*Tr).^(al+bta)) + (((tdata).*Tr).^(2*al)).*(l3^2 + 2*l3*cos(0.5*pi*bta)*(((tdata).*Tr).^(bta)) + (((tdata).*Tr).^(2*bta))))));
gs = EI./ER;
sm_exp = ydata(1,:);
lm_exp = ydata(2,:);
lf_exp = ydata(3,:);
E = gs.*sm_exp - lm_exp;
%E = sum((gs.*sm_exp - lm_exp).^2);
%ya = EI./ER;
%clf;
%loglog(sm_exp,lf_exp,'*');
%hold on;
%loglog(sm_exp,ya,"r");
%drawnow;
end
7 个评论
Torsten
2024-1-17
You can do that by yourself. Use MATLAB online if your MATLAB supplies a different or no solution.
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