Error in ode45; Graphing ODE

I'm trying to graph two ODE, but I keep getting an error.

1. 
2. 

function dcdt = CODE(t,p)
v1 = 330;
v2 = 170;
cbar = 10;
k = 5.5;
cdcdt = [ p(1).*((p(2)*k+k)/v1);
    p(2).* ((k*p(1)-k)-cbar/v2)];
end
t0 = 0;
tfinal = 180;
p0 = [1; 1];

[t,p] = ode45(@CODE, [t0 tfinal],p0); 
plot(t,p)
title('Concentrations over time')
xlabel('t')
ylabel('concentration') 
legend('C1','C2')

Error in ode45 (line 115)

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

Error in concen (line 6)

[t,p] = ode45(@CODE, [t0 tfinal],p0);

Answer 1

[Star Strider]

Note that ‘cdcdt’ is not the same as ‘dcdt’.

Change this to:

dcdt = [ p(1).*((p(2)*k+k)/v1);
    p(2).*((k*p(1)-k)-cbar/v2)];

and it works, although it has a singularity at t=5.726570e+00, and stops with an appropriate warning.

We all encounter our own typographical errors, so no worries!