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Simulink help

  1. May 9, 2009 #1
    Hi,

    I have a project due that has to be done in Simulink.

    I am somewhat familiar with Simulink, but some things dont make sense to me.

    First off, What determines the time step between each iteration? eg. when you have a clock in the model, what determines the change in time from one iteration to the next?

    I remember working with a model once, and changing something in the model changed the sampling frequency for some reason, shich makes no sense to me.

    Thanks

    Raman
     
  2. jcsd
  3. May 9, 2009 #2
    You can change the step size in the settings of the menu bar along with what kind of numeric solver it uses. i.e. ode45,ode23, etc.
     
  4. May 10, 2009 #3
    So if I have a input array which is to be used in the system, then I have to make sure the values in the input array are spaced the same time apart as the step size I specify in Simulink Options?
     
  5. May 12, 2009 #4
    How do I add an imput variable that is not a constant?

    I have an array of values that I want the system to use, but I dont know how to get it to read the array one element at a time (each iteration I want it to take in one value from the array, and as it goes on it will read down the array).

    Thanks
     
    Last edited: May 12, 2009
  6. May 12, 2009 #5
    I'm not sure, I would google that or look on the mathworks website. It may well be that simulink just interpolates points if it needs to.
     
  7. May 12, 2009 #6
    Again, a question for the mathworks forums.
     
  8. May 16, 2009 #7
    thanks i was able to solve itl its jsut the "from workspace" block.
     
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