MATLAB: Ode23s problem with input arguments

MATLABode23too many input arguments

I always seem to have difficulty understanding how to arrange input arguments for a system with two differential equations.
The error codes that I am receiving are that I have
1) Too many input arguments
2) Error in odearguments (line 90) f0 = feval(ode,t0,y0,args{:}); % ODE15I sets args{1} to yp0.
3) Error in ode23s (line 121) = odearguments(FcnHandlesUsed, solver_name, ode, tspan, y0, options, varargin);
Thank you for the help and I wish to understand how to debug this error.

Best Answer

A very trivial mistake. ODE45 requires that the inputs to your function be both t and Y, even if you never plan on using t.
%This function computes the concentration of reactant A and temperature 
%profile of an endothermic CSTR. 
function r = CSTRHW4(t,Y) 
 %% stuff
end
Also it is highly suggested you do not use 
clear all
Instead, just use the normal clear. Calling clear all decreases code performance, and is usually unnecessary. For more information, see the Tips section.
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