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

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Noob
Noob on 21 Jun 2021
Edited: Sargondjani on 23 Jun 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.
Thanks in advance,
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.

Answers (1)

Sargondjani
Sargondjani on 23 Jun 2021
Edited: Sargondjani on 23 Jun 2021
Replace the first line with:
H = @(X)fsolve_root_finding(X(1),X(2));

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