# How to put fsolve in a loop, using 2 unknowns?

1 vue (au cours des 30 derniers jours)
Noob le 21 Juin 2021
Modifié(e) : Sargondjani le 23 Juin 2021
Hi,
I want to write a code that asks fsolve to go through some combinations of guesses and then find all the roots (xdot, ydot) to the equation, but I'm having some trouble debugging the code. I defined the function locally, without saving it in a separate file.
H = @(xdot, ydot) fsolve_root_finding(xdot, ydot);
for xdot = linspace(1,5,5)
for ydot = linspace(-5,-1,5)
[ my_root, fval, exit_flag ] = fsolve( H, [ xdot, ydot ] )
plot( my_root, 'bx','MarkerSize',10 );
end
hold on
end
function G = fsolve_root_finding(xdot, ydot)
G(1) = xdot + ydot;
end
Here's the current error message:
Not enough input arguments.
Error in fsolve_practice>@(xdot,ydot)fsolve_root_finding(xdot,ydot)
Error in fsolve (line 242)
fuser = feval(funfcn{3},x,varargin{:});
Error in fsolve_practice (line 9)
[ my_root, fval, exit_flag ] = fsolve( H, [ xdot, ydot ] )
Caused by:
Failure in initial objective function evaluation. FSOLVE cannot continue.
##### 0 commentairesAfficher -2 commentaires plus anciensMasquer -2 commentaires plus anciens

Connectez-vous pour commenter.

### Réponses (1)

Sargondjani le 23 Juin 2021
Modifié(e) : Sargondjani le 23 Juin 2021
Replace the first line with:
H = @(X)fsolve_root_finding(X(1),X(2));
##### 0 commentairesAfficher -2 commentaires plus anciensMasquer -2 commentaires plus anciens

Connectez-vous pour commenter.

### Catégories

En savoir plus sur Loops and Conditional Statements dans Help Center et File Exchange

### Community Treasure Hunt

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

Start Hunting!

Translated by