function not plotting, but no error message

I created this function and plot but it is not plotting and I am not getting any error message.

%x1'=-3x1-200x2

%x2'=200x1-3x2

opts = odeset('RelTol',1e-6,'AbsTol',1e-8);function [dXdt] = Problem02ODEFunction(t,X)

soln = ode45(@Problem02ODEFunction,[0 1],[-10 10],opts);

figure;

plot(soln.x,soln.y(1,:),'-','linewidth',0.5);

hold on;

plot(soln.x,soln.y(2,:),'-','linewidth',0.5);

grid on;

title('Problem 2 ODE45 Solution');

xlabel('Time (s)');

ylabel('Solution');

legend('x_{1}(t)','x_{2}(t)','location','best');

function [dXdt] = Problem02ODEFunction(t,X)

x1 = X(1);

x2 = X(2);

dx1dt = -3*x1 - 200*x2;

dx2dt = 200*x1 - 3*x2;

[dXdt] = [dx1dt; dx2dt];

end

Answer 1

[Dyuman Joshi]

The code after the semi-colon in this line of code seems to be a typo

opts = odeset('RelTol',1e-6,'AbsTol',1e-8);function [dXdt] = Problem02ODEFunction(t,X)

After removing it, the code works and the plots are there -

%x1'=-3x1-200x2
%x2'=200x1-3x2
opts = odeset('RelTol',1e-6,'AbsTol',1e-8);

soln = ode45(@Problem02ODEFunction,[0 1],[-10 10],opts)

soln = struct with fields:
     solver: 'ode45'
    extdata: [1×1 struct]
          x: [0 2.4865e-04 0.0013 0.0023 0.0033 0.0041 0.0048 0.0055 0.0064 0.0073 0.0083 0.0093 0.0103 0.0112 0.0121 0.0127 0.0135 0.0143 0.0153 0.0162 0.0173 0.0183 0.0192 0.0199 … ] (1×1148 double)
          y: [2×1148 double]
      stats: [1×1 struct]
      idata: [1×1 struct]

figure; 
plot(soln.x,soln.y(1,:),'-','linewidth',0.5);
hold on;
plot(soln.x,soln.y(2,:),'-','linewidth',0.5);
grid on;
title('Problem 2 ODE45 Solution');
xlabel('Time (s)');
ylabel('Solution');
legend('x_{1}(t)','x_{2}(t)','location','best');

function dXdt = Problem02ODEFunction(t,X)
x1 = X(1);
x2 = X(2);
dx1dt = -3*x1 - 200*x2;
dx2dt = 200*x1 - 3*x2;
[dXdt] = [dx1dt; dx2dt];
end

[Jon]

for this class project they want us doing it in live editor, I removed that semicolon and it still doesn't plot. I shared the whole .mlx file, maybe something else you see is causing a conflict.

[Dyuman Joshi]

No, you don't have to remove the semi colon, you have remove the part after the semi-colon.

I'll take a look at the file and get back at you.