How do I pass known variables into my ODE45 function?

Bobby H

2016 2 6

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Hi,

I am attempting to pass a set of variables (a1,a2,a3,...an - these numbers can be integers,vectors and arrays) into an ODE function to avoid having to call these variables on each iteration of the ODE as the call function is quiet slow. I want to make it so that I call the variables (from excel files) before the ODE and use these variables as inputs to the ODE, therefore avoiding the need to call the function in the ODE function itself, but do not know how to do this.

Could anybody help with letting me know the syntax to read these variables into the ODE?

The set up of my ODE code is shown here:

at = 1e-5*ones(Neqn,1); % Absolute tolerance for ODE
tE = 0; % Start time for ODE
endtime = 50e3; % End time for ODE
span = [tE endtime]; % ODE time span
options = odeset('RelTol',1e-4,'AbsTol',at); 
[t,y] = ode45(@Reactor_simple_ODE,span,init,options);