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Why am I receiving error messages about singularities in my Simulink model?

 I am receiving the following error messages about singularities in my Simulink model:

 

 Derivative of block at time is Inf of NaN.  Stopping Simulation.  There may be a singularity in the solution.  If not, try reducing the step size (either by reducing the fixed step size or by tightening the error tolerances.)

I have tried reducing the step size and adjusting tolerances, but I still receive this error message. I have also tried changing solvers, some solvers will just get to one point of the simulation, and hang.


 NOTE:-


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This message may be caused by a singularity in your system. One situation where this may occur is if the values of your states differ by a large magnitude. If this is the case, the Simulink solver will have a hard time resolving your step size within the error tolerance as it attempts to "bounce" back and forth between the states.
To check if this is the case:
1. Return the states of your system as follows-
a) In the model editor go to Simulation-> Configuration Parameters
b) Select Data Import/Export, in the 'Save to Workspace' field, check 'States' to log the states as output
2. Run the simulation.
3. Plot:
plot(tout,xout)
You can see if one of the states is changing over a wide range compared to the others.

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