Why does the stateflow function 'hasChanged(PS)' not work when PS is a vector?

2017 4 3
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更新时间：2017 4 11
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Coder Error: PS contains a matrix or a structure type and cannot be used with change detection.? WHen PS is a scalar value, it works fine.

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Gillian Rosen
Gillian Rosen 2017-4-10

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Hi Nandish,
I understand that when you use the 'hasChanged' function in your Stateflow chart, you encounter an error that indicates that your input PS is a matrix or structure and therefore cannot be used with change detection. 
If you are using MATLAB as your action language, you unfortunately can only use a scalar value as input to hasChanged. If you would like to use vector or matrix inputs with hasChanged, please use C as your action language instead. See the note in the "hasChangedTo" section of the change detection documentation for more information: 
https://www.mathworks.com/help/releases/R2016a/stateflow/ug/detecting-changes-in-data-values.html#bq44kqg

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Nandish Calchand
Nandish Calchand 2017-4-11
Hello, Thank you very much. Indeed the action language was the problem. But in the documentation of hasChanged(u), it does say that u can be a vector. Anyways thanks a lot. Nandish

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