MATLAB: How to solve this issue

MATLABode45

Hello there,

I got this error when i use ODE15s solver :

Error using odearguments (line 113)

Inputs must be floats, namely single or double.

Error in ode15s (line 150)

odearguments(FcnHandlesUsed, solver_name, ode, tspan, y0, options, varargin);

Error in simple (line 44)

[T1,cox]=ode15s(@(t,y1) Costatesimple(t,y1,u,x1,x2,yd,x1t,e1,w1,w2,w3,w4,v1,v2),tspan2,[0 0 0 0 0 0 0],options);

any help please?

Note: i used syms in diffrent file to get some parameters and save it as a datafile then load it in Costatesimple file…

thank you so much indeed

Best Answer

If the extra parameters (or any other values) you are passing to ‘Costatesimple’ are symbolic, (and do not contain any symbolic variables), it will be necessary to use the double function to convert them to double-precision values that ode15s can use.

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MATLAB: How to make this ode45 work

Your equations must be set up as differential equations, using the Symbolic Math Toolbox diff function to create the derivatives.

Then, use the odeToVectorField and matlabFunction functions to create the necessary first-degree equations and the anonymous function to use with ode45.

MATLAB: How to get ode45 to work with the function

Your code is not easy to follow.

My guess is that this line is throwing the error:

k = kt*exp((E/R2)*((1/T0)-(1/f)));

The most likely solution is to evaluate ‘f’, since that changes it from a function handle to a function evaluation:

k = kt*exp((E/R2)*((1/T0)-(1/f(X))));

Best Answer

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MATLAB: How to make this ode45 work

MATLAB: How to get ode45 to work with the function

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