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matlabsimulink

Sampling time as an input-simulink

I am trying to make a library of functions that will allow me to parameterize filters and other function. In simulink standard blocks, I am only able to set a sampling time prior, rather than take an input. Is there any ideas on how I can create this? My first approach was to use conditionals and a clock to allow this parameter to exist, but the clock cannot be parameterized either.

Thanks in advance.

Solution

  • The only way to do this is to write each of your blocks as S-Functions.

    If you are using m-code then within the setup method you'll need to define the block sample time as

    block.SampleTimes = [-2 0];

    then within the output method you'll need to set the next sample time (based on the value of the input signal) by assigning the new value into block.NextTimeHit. An example of doing this can be found here: A Square Wave with Jitter

    A similar thing can be done in a c-mex S-Function by using the mdlGetTimeOfNextVarHit method.