ode45 , order arguments

I am getting these two errors when i run my code. I rececntly used the code for a different problem with no questions. How can i get it to run.

Error in ode45 (line 115)

odearguments(FcnHandlesUsed, solver_name, ode, tspan, y0, options, varargin);

Error in quartercar (line 37)

[time, state_values] = ode45(sdot,tspan,IC);

This is my code,

function quartercar
k1 = 80000; %N/m
k2 = 500000;%N/m
m1 = 2500; %kg
m2 = 320; %kg
b1 = 350; %Ns/m
b2 = 15020; %Ns/m
rd  = @(time) 0.15*sin(time)^2;
rdprime = @(time) 0.15*sin(2*time);


%Initial Conditions 
xone0 = 0; vone0 = 0;
xtwo0 = 0; vtwo0 = 0;

IC = [xone0, vone0, xtwo0, vtwo0];

%Time Span 
t0 = 0; tf = 10;

tspan = [t0,tf];

%sdot = g(t,s) state variable
sdot = @(t,s) ...
    [s(2); 
    (-1/m1)*((k1*(s(1)-s(3))) + (b1*(s(2)-s(4))));
    s(4);
    ((k1*(s(1)-s(3)) + b1*(s(2)-s(4)) -k2*(s(3)-rd) -b2*(s(4)-rdprime))/m2)];

i am guessing the problem is here

%Numerical Intergration
[time, state_values] = ode45(sdot,tspan,IC);
xone = state_values(:,1);
vone = state_values(:,2);
xtwo = state_values(:,3);
vtwo = state_values(:,4);

%Plots
plot(time,xone)
xlabel('time (s)')
ylabel('displacement (m)')
title('Displacement vs Time')
grid on

end

Answer 1

[Walter Roberson]

quartercar

function quartercar
k1 = 80000; %N/m
k2 = 500000;%N/m
m1 = 2500; %kg
m2 = 320; %kg
b1 = 350; %Ns/m
b2 = 15020; %Ns/m
rd  = @(time) 0.15*sin(time)^2;
rdprime = @(time) 0.15*sin(2*time);


%Initial Conditions 
xone0 = 0; vone0 = 0;
xtwo0 = 0; vtwo0 = 0;

IC = [xone0, vone0, xtwo0, vtwo0];

%Time Span 
t0 = 0; tf = 10;

tspan = [t0,tf];

%sdot = g(t,s) state variable
sdot = @(t,s) ...
    [s(2); 
    (-1/m1)*((k1*(s(1)-s(3))) + (b1*(s(2)-s(4))));
    s(4);
    ((k1*(s(1)-s(3)) + b1*(s(2)-s(4)) -k2*(s(3)-rd(t)) -b2*(s(4)-rdprime(t)))/m2)];  %CHANGED
%Numerical Intergration
[time, state_values] = ode45(sdot,tspan,IC);
xone = state_values(:,1);
vone = state_values(:,2);
xtwo = state_values(:,3);
vtwo = state_values(:,4);
%Plots
plot(time,xone)
xlabel('time (s)')
ylabel('displacement (m)')
title('Displacement vs Time')
grid on
end

[Darron Muzavazi]

Thank you!