Errors in solving nonlinear simultaneous equations

3 visualizzazioni (ultimi 30 giorni)
Hello all, I'm trying to solve nonlinear simultaneous equations. However, Matlab is giving errors, which I cannot rectify. Any help is much appreciated.
I made a function file:
function [ f ] = nlsimul( x)
%nlsimul has two nonlinear simultaneous equations in variable x(1), x(2)
f = [-2*(x(1).^2).*exp(-x(1).^2-(x(2).^2))+exp(-x(1).^2-(x(2).^2)); ...
-2.*x(1).*x(2)*exp(-x(1).^2-(x(2).^2))];
end
Then I made a script file to solve this system of equations:
%This script calles nlsimul() to solve nonlinear simultaneous equations
options = optimoptions('fsolve','Diagnostics','on','Display','iter','PlotFcns','@optimplotresnorm');
x0=[2,2];
[x,fval,exitflag,output] = fsolve(@nlsimul,x0,options)
Upon running this script file, Matlab gives several errors. Can someone help?

Risposta accettata

Sven
Sven il 31 Lug 2013
Modificato: Sven il 31 Lug 2013
You can't plot a simultaneous equation during iterations in that way.
If you instead put:
options = optimoptions('fsolve','Diagnostics','on','Display','iter');
Then your optimisation runs perfectly.
If you instead put (note the function handle rather than string):
options = optimoptions('fsolve','Diagnostics','on','Display','iter','PlotFcns',@optimplotresnorm);
Then it solves fine as well... it's too quick to see anything plotted though...
Did that help you out?

Più risposte (0)

Categorie

Scopri di più su MATLAB in Help Center e File Exchange

Prodotti

Community Treasure Hunt

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

Start Hunting!

Translated by