MATLAB: Could anyone explain to me the method used by the ode23s function

functionmatlab functionnumerical integrationodes-function

Hi,

Could anyone explain to me the method used by the ode23s function? I know it is applied to rigid differential equations as well as other solvers. But I did not find the material that explained in more detail about the numerical method in question. Is it only applied to continuous systems? What's your difference with ode15s?

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ordinary-differential-equation-solvers-ode23-and-ode45

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MATLAB: Complex solutions in ode23s

I guess there exist some operation in the calculation of your time derivatives that gives a complex result (e.g. sqrt of a negative number, logarithm of a negative number, x^a where x is negative ...)

MATLAB: Ode23s problem with input arguments

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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MATLAB: Complex solutions in ode23s

MATLAB: Ode23s problem with input arguments

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