Having error "Can't define variable t"

function dydt = problem(t,y)
dydt= 5*exp(4*t)-3*y;
end

tspan=[0,1];
initial=10;
[t,y]= ode45(@problem,tspan,initial);
plot(t,y,'-o');

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Hi this is my code and I am having difficulties to run this code.

How can I fix it?

Directions keep telling me that "Can't define variable t"

Do i need to reinstall MATLAb?

Answer 1

[KSSV]

Why do you want to reinstall MATLAB? You are not running the function/ code properly. Copy your code in a single file, make it a function and run it. OR save the function problem into a file and run the code another file or in workspace.

tspan=[0,1];
initial=10;
[t,y]= ode45(@problem,tspan,initial);
plot(t,y,'-o');

function dydt = problem(t,y)
    dydt= 5*exp(4*t)-3*y;
end

[JU YEON SIM]

Extremely thanks

I gotcha