Unrecognized function or variable 'x'.
1 view (last 30 days)
Show older comments
Hello.
I don’t understand why I don’t have x defined after running the code, if initially it says errors. Help me please
function F=M36(x)
F=[3*x(1)*x(2) - x(1)^2 - x(2)^2 - 5;
7*x(1)^2 * x(2)^2 - x(1)^4 - x(2)^4 - 155];
options = optimoptions('fsolve','Display','iter');
[~,~] = fsolve(F,[-4,0],options);
[~,~] = fsolve(F,[0,4],options);
disp('Plotting graphs of the left sides of the system equations:')
x=-5:0.1:5;
y= (3/2).*x+ sqrt((13/4).*x.^2+5);
plot(y,x,'b')
hold on
x=-5:0.1:5;
y = sqrt((x^4 + 155) / (7*x^2 - y^2));
plot(y,x,'b')
hold on
grid on
legend('Graphic solution');
end
3 Comments
Walter Roberson
on 16 Nov 2023
syms x [1 2]
eqns = [3*x(1)*x(2) - x(1)^2 - x(2)^2 == 5;
7*x(1)^2 * x(2)^2 - x(1)^4 - x(2)^4 == 155]
sol = solve(eqns)
subs([x1, x2], sol)
Answers (1)
Walter Roberson
on 16 Nov 2023
F = @(x)[3*x(1)*x(2) - x(1)^2 - x(2)^2 - 5;
7*x(1)^2 * x(2)^2 - x(1)^4 - x(2)^4 - 155];
0 Comments
See Also
Categories
Find more on Calculus in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!