Error Message "Input argument 't' might be unused" OR "Not enough Input Arguments"

function dvdt = deqn(t,v,M,G,K)

dvdt = [v(1); G-((K/M)*(v^2))];

M = 5;

K = 0.125;

G = 32;

tspan = (0:5);

v0 = [0 0];

[t,v] = ode45(@(t,v) odefun(t,v,M,G,K), tspan, v0);

plot(t,v)

Can anyone help me fix this? I need 't' to graph a velocity versus time function using this ODE.

Answer 1

[Star Strider]

Try this:

odefun = @(t,v,M,G,K) [v(1); G-((K/M)*(v(2)^2))];                   % Guessing That The ‘v^2’ Term Should Be ‘v(2)^2’
M = 5;
K = 0.125;
G = 32;
tspan = (0:5);
v0 = [0 0];
[t,v] = ode45(@(t,v) odefun(t,v,M,G,K), tspan, v0);
plot(t,v)

That worked when I ran it (R2020a).

[Cheyenne Warren]

It worked, thank you so much!

[Star Strider]

My pleasure!

If my Answer helped you solve your problem, please Accept it!

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