Error "Function definitions are not permitted in this context" in matlab R2014a

I've tried to solve this system of equations: y_1 '=y_2 and y_2 '=-y_1 as follows:

clear all;
clc;
function dy = rigid(t,y)
dy = zeros(2,1);
dy(1) =y(2);
dy(2)=-y(1);
[T,Y] = ode113(@rigid,[0 12],[0 1 1]);
plot(T,Y(:,1),'-',T,Y(:,2),'-.')

but there's this error "Function definitions are not permitted in this context".

I was wondering if someone could help me about my problem.

Thanks in advance.

Answer 1

[Jon]

You can not define functions on the command line. Open up a new file and edit it there

On the MATLAB menu bar HOME>New>Function

[Ali Saffar]

It works properly. Thank you very much.

Answer 2

[Walter Roberson]

In R2014a, it was not permitted to define functions inside a script file.

Furthermore, functions defined inside a script file cannot be called from outside the script (not unless the script exports a copy of a handle to the function.)

You need to delete the lines

clear all;
clc;