Simulink algebraic loop matlab function error

Hi,

I am trying to get around an algebraic loop error (see attached picture). I have an embedded Matlab function that computes the variable dirc, but it requires it's own output as an input (making a loop). I have tried putting in an IC block to give it an initial guess, and I have tried an algebraic constant block, but both have failed. Any suggestions?

Thanks

Answer 1

[Sebastian Castro]

Dylan,

Algebraic loops happen in these situations where the output of your block directly depends on the input.

If you're running this algorithm at a particular time-step, and can get away with delaying the input dir by one step (i.e., you use the previously calculated value to compute a new output), you should insert a Unit Delay block in the feedback loop from dirc to dir.

- Sebastian