Implementing a step response within for loop environment?

Question

Juan Heredia 2017-10-24

0
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https://ww2.mathworks.cn/matlabcentral/answers/363073-implementing-a-step-response-within-for-loop-environment

回答： Kuifeng 2017-10-25

I'm currently working on a model that is being implemented in a for-loop environment (I know the feedback() function exists but I need to look at the signals as they loopback, and change parameters mid-loop).
In theory, a section of the model creates a step signal that goes into a simple transfer function and continues to the rest of the model. But I'm having a hard time applying the transfer function, essentially on a per index basis.

I'm wondering if any of you have any tips or suggestions on how to proceed with this implementation. As an example, this is what the pseudo-code would look like for a sample of the model:

time = linspace(0,100,500);
for i = 1:length(time)
    sig(i) = sin(2*pi*4e6*time(i) + Phase(i-1) );
    % More code that uses sine wave to generate a step-like signal every now and then
    % Would usually use 'lsim' to apply tf's, but doesn't work on a per-index basis in this case
    StepResp(i) = tf * unitStep(i);
    % More calculations
    Phase(i) = .....;    
  end