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I want to plot an output response from a state space model. I use StateResponse[] to calculate it and then plot it. When I run my code, I face this message:

NDSolve::mxst: Maximum number of 10000 steps reached at the point t == 0.007796405242565201`.

I do not even use NDSolve[] command to solve my equations! This is my code and its answer:

u = -kk.StateResponse[ssmModelC, UnitStep[t] , {t, 0, 10}]

How is it possible to increase number of steps in StateResponse[]?

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  • $\begingroup$ Could you provide a minimum working example? $\endgroup$
    – Rod
    Jul 2, 2013 at 18:50
  • $\begingroup$ @ Rod LM :I edited my post and give an example. Hope you find it useful! $\endgroup$
    – Shield
    Jul 2, 2013 at 18:57
  • $\begingroup$ @user8364 But you forgot to put your definition for ssmModelC... the code is still not working. $\endgroup$
    – Rod
    Jul 2, 2013 at 18:59
  • $\begingroup$ @ Rod LM : Actually, ssmModelC is a 120*120 Matrix and 3 more huge matrixes, which build my space state model, and I can not put them here! The point is Maximum steps to calculate the response between 0 and 10 seconds! I have no idea to increase the number of steps! $\endgroup$
    – Shield
    Jul 2, 2013 at 19:04
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    $\begingroup$ This option would work Method -> {"NDSolve", MaxSteps -> value}, although undocumented. $\endgroup$
    – Suba Thomas
    Jul 2, 2013 at 20:31

1 Answer 1

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The MaxSteps option (or any other option to NDSolve) can be adjusted by specifying it as a suboption.

u = -kk.StateResponse[ssmModelC, UnitStep[t] , {t, 0, 10}, Method -> {"NDSolve", MaxSteps -> value}]

The only caveat is that it is not yet documented.

And regarding when NDSolve is used, pretty much when there is a continuous-time system and the time specification is of the form $\{t, tmin, tmax\}$.

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  • $\begingroup$ Thank you so much! It is absolutely perfect! $\endgroup$
    – Shield
    Jul 3, 2013 at 6:33

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