Using odesolver with functions that have many inputs

I'm trying to use ode45 to integrate a first order differential equation. The first line of my function m-file is

function dEds = dPdE(s, E, U0, H0, mu, T, t, initial, final,timestep)

s is my independent variable, and E(s) is what I am solving for. All the other variables are matrices or scalars, and are used in the m-file. My question is, when using ode45, how do I specify these other variables? On this page

<http://www.mathworks.com/support/solutions/en/data/1-1C6YS/index.html?product=ML&solution=1-1C6YS>

other inputs are being put in after the (blank) options, and I verified for myself that it can work, but I haven't seen any documentation refer to that. Furthermore it doesn't seem to be working when I try and solve my equation:

[s E]=ode45(@dPdE,[0 5],E(321),[],U0,H0,mu,5,3.2,2,3,.01);

It says too many input arguments. How can I make this go?

(A more trivial question I have is whether I need to put s as an input argument if the function never uses it.)

Answer 1

[Andrew Newell]

The documentation in the link you provide probably applies to an older version of MATLAB than you have. Instead, create an anonymous function:

f = @(s,E) dPdE(s, E, U0, H0, mu, T, t, initial, final,timestep);

Then you can solve the equation using

 [s, E]=ode45(f,[0 5],E(321));

Yes, you do need to provide s as an input argument.

[Arun]

Thanks, I appreciate the help Andrew.