about error in stateflow

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Pham Van Dung
Pham Van Dung 2012-10-15
dear,
when i implement stateflow in block to mult or add signals in stateflow, i have this error:
_Cannot solve algebraic loop involving 'SUMOFPRODUCT/Sumofproduct/Product1' because it consists of blocks that cannot be assigned algebraic variables, i.e., blocks with discrete-valued outputs, blocks with non-double or complex outputs, Stateflow blocks, or nonvirtual subsystems
Need for helping!
Best regards!
Pham van Dung

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Azzi Abdelmalek
Azzi Abdelmalek 2012-10-15
编辑：Azzi Abdelmalek 2012-10-15
You have an algebraic loop means that in your model you have a feedback through a block which don't contain any delay, it's like you write y(n)=2*y(n)+1, which is not correct, you should write y(n+1)=2*y(n)+1. to correct insert before your feedback a unit delay block
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Pham Van Dung
Pham Van Dung 2012-10-15
i didn't use any function in my project, just only use add and product block in simulinks. This is my model:
http://www.mediafire.com/?v46tbexxc0z572s
Can you give me the ideal for this problem. thanks you so much!!
Pham Van Dung
Azzi Abdelmalek
Azzi Abdelmalek 2012-10-15
you have two feedback to your chart, add two unit delay block from simulink/discrete

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