Implementing a while loop

Question

BEngEEStudent 2017-3-9

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/328955-implementing-a-while-loop

回答： Brandon Eidson 2017-3-15

I want to create a while loop which loops until the end of simulation. Is this possible? My matlab function block has 2 inputs (idir , and batsoc) and 2 outputs (goboost & gobuck)

my code is:

function [gobuck, goboost]= fcn(batsoc, idir)    
gobuck = 0;
goboost = 0;
while (idir < 0) || (idir > 0)
    gobuck = 0;
    goboost = 0;
    if batsoc < 97
        gobuck = 1;
        goboost = 0;
      elseif batsoc > 98
       goboost = 1;
       gobuck = 0;
      end
  end
end
    end

Thanks

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Adam 2017-3-9

idir never changes in your while loop so it isn't an appropriate loop constraint.

What is it that is supposed to signal the end of your simulation in order for the loop to stop?

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Answer 1

Brandon Eidson 2017-3-15

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/328955-implementing-a-while-loop#answer_258858

Hey Fazal, a MATLAB Function block with execute each simulation time step. This means that, each time step, the entire while loop will be executed. Based on your post and the fact that "idir" is not updated in the MATLAB Function block, I do not think this is what you intend.

Because your outputs look like booleans and are based on some simple logical conditions, I think you have a couple good options for implementing this outside of a MATLAB Function block (and outside of a while loop).

1) use a basic Stateflow chart: https://www.mathworks.com/help/stateflow/programming-in-stateflow.html

2) use a combination of Logic Operator blocks: https://www.mathworks.com/help/simulink/logic-and-bit-operations.html

You may already be utilizing these but, in case not, you should be aware of various conditionally-executed subsystems.

https://www.mathworks.com/help/simulink/conditional-subsystems-1.html

Combining these features should allow you to implement your desired model.