Dear all,

what does this errro message stand for (I am simulating a simulink model including S-Function Block):


Derivative at time 0 is Inf or 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).

Thanks for your help

"Meriem" <ma1615@bris.ac.uk> wrote in message <ibjc7s$1j7$1@fred.mathworks.com>...
> Dear all,
> 
> what does this errro message stand for (I am simulating a simulink model including S-Function Block):
> 
> 
> Derivative at time 0 is Inf or 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).
> 
> Thanks for your help

This Tech-Note may help you:
Why do I receive division by zero errors when passing in transfer functions with leading zeros for denominator in model reference arguments? 

http://www.mathworks.com/support/solutions/en/data/1-5OKNCU/?solution=1-5OKNCU

Aurélien
http://blog.developpez.com/matlab4geek/