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

 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.

Answer 1

[Gillian Rosen]

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

[Nandish Calchand]

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