MATLAB: How to use internal solutions generated during ODE solver for the next ODE iteration

algebraic equationsdifferential equationsinternal valuesiterationsodeode solverrecalculationsavingsuccessful iteration

I have a set of differential equations to be solved using ode23, which depends on a variable called "heat flux Q".

However, the "heat flux Q" needs to be recalculated after every successful iteration using the formula shown in the image, indicating that the previous values of "radius r " and "time t" generated within the ODE solver are needed.

Does anyone have a way for this?

Best Answer

Use dde23 instead of ode23:

http://de.mathworks.com/help/matlab/ref/dde23.html

Best wishes

Torsten.

Related Solutions

MATLAB: Algebraic and differential equation

bvp4c cannot handle differential and algebraic equations simultaneously.

Solvers from the ODE-Suite can. Take a look at the "MASS" option under

http://de.mathworks.com/help/matlab/ref/ode45.html

Best wishes

Torsten.

MATLAB: Solving ODE

x_y_z = [1 -1 -5;3 1 -3;0 1 -1] \ [5 5 -4].';

And crosschecking the second line:

>> 3*x_y_z(1)+x_y_z(2)-3*x_y_z(3) ans = 5

The values in the matrix to the left of the \ have been read off from the x, y, and z coefficients of the linear equations. The values in the vector to the right of the \ have been read off from the implicit right hand sides (constant terms) of the linear equations.

Best Answer

Related Solutions

MATLAB: Algebraic and differential equation

MATLAB: Solving ODE

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