loop algebraic and variable signal

Hi....i need help with a algebraic loop ...

I am developing a dinamic system, where i need that my sfunction have inputport that receive variable signal....i have solved the problem of inputport and outport dinamically but my s-functions is feedback then i have the following errorand don`t know to solve.

Block 'untitled/Control del Ciclo' has variable-size signals, and it resides within an algebraic loop. Variable-size signals do not support algebraic loops. Consider eliminating the algebraic loop.

please help me..

Answer 1

[Sebastian]

As the error message states, the iterative solver for algebraic loops is not able to solve the loop in your system because it involves variable-size signals. In that case the loop needs to be eliminated by a redesign of the model or by breaking the loop by adding a Memory block for instance.

See http://www.mathworks.com/support/solutions/en/data/1-16V6S/index.html?solution=1-16V6S for more details.

Answer 2

[Vieniava]

You may try to insert unit delay block

into the feedback line. Of course if this delay isn't critical for your simulation aim.