how to increase 'MaxFunEvals'
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I want to increase 'maxFunEvals' in my program, but it doesn't work. What is the problem of my program?
clear all;
a = 0.2; %field loss coefficient α[db/km]
alfa = a*log(20)/20;
gamma = 1.3; % fiber non-linearity coefficient
Ns = 20; %number of span
Ls = 100; %span length[km]
beta2 = 20.7; %dispersion coefficient[ps^2/km]
roll = 0.3; %roll-off of gwdm
%% formula of ρ
syms f f1 f2 real %f,f1,f2 is THz
Le = (1-exp(-2*alfa*Ls))/(2*alfa);
x1(f1,f2,f) = 1-exp(-2*alfa*Ls)*exp(4j*(pi^2)*(f1-f)*(f2-f)*beta2*Ls);%symfun
x2(f1,f2,f) = 2*alfa-(4j*(pi^2)*(f1-f)*(f2-f)*beta2);
p(f1,f2,f) = Le^(-2)*(abs(x1(f1,f2,f)/x2(f1,f2,f)))^2;
%% formula of Gwdm
syms t w k
T=1/(32e-3);
A = pi*t/T;
x(t)= (sin(A)/A)*(cos(roll*A)/(1-(2*roll*t/T)^2));
X(w) = simplify(fourier(rewrite(x(t),'exp'),t,w));
X(f) =X(2*sym(pi)*f);
X(f)= rewrite(abs(X(f)),'sqrt');
xfunc = matlabFunction(X(f));%@(f)
GWDM(f)= (symsum(xfunc(f+(50e-3)*k),k,-5,5)/((32/8.8)*T));
func = p*GWDM(f1)*GWDM(f2)*GWDM(f1+f2-f);
ft=matlabFunction(func);
%% formula of GNLI
pint = @(f)integral2(@(f1,f2)ft(f1,f2,f),-270.8e-3,270.8e-3,-270.8e-3,270.8e-3,'MaxFunEvals',20000);
NLI = @(f)(16/27).*Ns.^1.03.*gamma.^2.*Le.^2.*pint(f); % NLI
%f = -0.3:0.005:0.3;
%plot(f,arrayfun(@(f)NLI(f),f));
%hold on
%plot(f,GWDM(f));
%hold off
5 Comments
Torsten
on 19 Dec 2022
I suggest you plot NLI for reasonable values of f to see how the function behaves.
Accepted Answer
Matt J
on 19 Dec 2022
Edited: Matt J
on 19 Dec 2022
The problem is that integral2 does not support an option called 'MaxFunEvals'. You imagined somehow that it does.
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