Can not solve DAE! Problems with good initial values

Hello guys!

I am unexperienced in Matlab and I am struggling a lot with solving my codes with DAE system. Most of the time the warning comes:

Warning: Matrix is singular, close to singular or badly scaled. Results may be inaccurate. RCOND = NaN.

> In ode15s (line 589)

In AKANmainmodell (line 22)

Warning: Failure at t=0.000000e+00. Unable to meet integration tolerances without reducing the step size below the smallest value allowed (7.905050e-323)

at time t.

> In ode15s (line 668)

In AKANmainmodell (line 22)

Elapsed time is 10.638367 seconds.

I think my initial values are wrong, since also sometimes I got received that error stating to choose better guess for initial value .

Here is a download link:

https://gofile.io/?c=OdbaNG

Answer 1

[Manali Gupta]

Hi Akan,

Refer to the following link for solving DAEs using MATLAB.

You can also find the solution to the issue you are facing in the answer posted here