Why isn't working?

Hi, I've been trying all day trying to make my code work, but I can't get to the problem. The error or errors I get are "not enough input arguments" and an error on line 8 (T = T0...). Please help me

Here's the function code and the main code

function dxdt = funcionVel(t,x)
M = 1200;
r = 0.25;
c = 20;
T0 = 1000;
t0 = 10;

T = T0*(1 - exp(-t/t0));
dxdt(1) = x(2);
dxdt(2) = T/(M*r) - c*x(2);
dxdt = dxdt';

end

%main code:

clear variables
clc

t = (0:0.1:10);
condInicio = [0;0;0];



[T,Y] = ode45(@funcionVel,t,condInicio);
x1 = Y(:,1);
plot(t,x1)

[Walter Roberson]

Duplicates https://www.mathworks.com/matlabcentral/answers/588706-why-my-code-isn-t-working?s_tid=srchtitle