Error using ode45 - Column vector

Hi, I have this error:

Error using odearguments (line 90)
@(T,P)('FUN1') must return a column vector.

But the function returns a column vector. Can anyone help me find my mistake? I have read the other questions people have asked on this and they were all entering row vectors. Here is my code:

The function:

function f = fun1(t,P)
f = zeros(3,1);
f(1) = -1.92*P(1);
f(2) = 1.92*P(1)-1.2*P(2);
f(3) = 1.2*P(2);
end

The code which uses the function:

dPdt = @(t,P)('fun1');
P0 = [1,0,0];

[t,P] = ode45(dPdt, [0 5], P0);

plot(t, P)

[Jan]

Please read http://www.mathworks.com/matlabcentral/answers/13205-tutorial-how-to-format-your-question-with-markup#answer_18099.

[Jen42]

Sorry, I have fixed it.

Answer 1

[Jan]

function main
P0 = [1,0,0];  
[t,P] = ode45(@fun1, [0 5], P0);  
plot(t, P)
end

function f = fun1(t,P)
f    = zeros(3,1);
f(1) = -1.92*P(1);
f(2) = 1.92*P(1)-1.2*P(2);
f(3) = 1.2*P(2);
end

The problem is the string 'fun1' in: dPdt = @(t,P)('fun1'). You do not want to get the string (row vector of type char) 'fun1', but the function handle @fun1.

[Jen42]

Thank you!