MATLAB Answers

Error using ode45

22 views (last 30 days)
esra ilhan
esra ilhan on 4 Dec 2020
Commented: esra ilhan on 4 Dec 2020
Dears,
I am having an error for ODE45 usage:
XDOT_P12_7B returns a vector of length 2, but the length of the initial conditions vector is 3. The vector returned by
XDOT_P12_7B and the initial conditions vector must have the same number of elements.
I don't see where the problem comes from, I define in the function file 3 variables and my derivative matrix also has 3 components only thing one of my derivatives is equal (it represents constant T)
I would be appreciated if someone can help me with this,
Thank you

  0 Comments

Sign in to comment.

Answers (2)

Bjorn Gustavsson
Bjorn Gustavsson on 4 Dec 2020
Perhaps your calling has become too "traditional" and is not properly supported. In that case (and in general) it might be enough to change the calling of ode45 to:
[Vb,x]=ode45(@(V,x) xdot_P12_7b(V,x),Vspan,ic);

  0 Comments

Sign in to comment.


Alan Stevens
Alan Stevens on 4 Dec 2020
You need to declare cpAB as a global variable in P12_7b. Better to try to do without global variables!
You have some other problems also, but as I don't have fsolve I can't do much more.

  1 Comment

esra ilhan
esra ilhan on 4 Dec 2020
What are the other problems you see, I change the cpAB and updated ODE45 but still I have error

Sign in to comment.

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!