Inputting frame-based signals to Stateflow Chart

Question

Jim Clay 2012-11-20

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https://ww2.mathworks.cn/matlabcentral/answers/54295-inputting-frame-based-signals-to-stateflow-chart

My Stateflow chart has only one input- "signal". It is a [64 1] frame-based signal. When I do Display->Signals & Ports->Signal Dimensions from the Simulink model I get the following error-

   Cannot propagate frame-based signal through input 'signal' because this input expects a sample-based signal.

I have set the dimensions of "signal" to [64 1] in Model Explorer, but that doesn't fix the problem. How can I input a frame-based signal to the Chart?

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Answer 1

Kaustubha Govind 2012-11-20

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编辑：Kaustubha Govind 2012-11-20

在 MATLAB Online 中打开

I'm not 100% sure, but seeing the error message, it looks like Stateflow charts don't support frame-based signals at this point. You might need to use the Unbuffer and Buffer blocks to convert your frame-based signals to sample-based signals, and vice-versa to attain the interface. Please see Buffering and Frame-Based Processing for more information.

I think this line from the Stateflow documentation may be key:

Note: Charts cannot inherit frame-based data sizes from Simulink signals.

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Jim Clay 2012-11-20

That's terrible. That makes Stateflow next to useless for me. Regardless, thank you for the information.

Jim Clay 2012-11-20

Is this not true of the other Stateflow blocks (e.g. State Transition Table)?

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Answer 2

Guy Rouleau 2012-11-21

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https://ww2.mathworks.cn/matlabcentral/answers/54295-inputting-frame-based-signals-to-stateflow-chart#answer_65991

As mentioned in the link provided by Kaustubha, it is important to realize that since R2010b, the concept of "frame-based" changed.

When you think about that, a frame is just a vector of data.

In the old way of thinking, the "frame-based" property was associated to signals.

The new way of thinking is to let the block decide if they process the data they receive in a frame-based manner or in a sample-based manner.

I introduced this change here:

http://blogs.mathworks.com/seth/2012/01/04/frames-from-signals-to-blocks/

In your case, you could try inserting a Reshape block or a Frame to Vector block before the chart. That way, the chart will receive the same data and you will be able to process it the way you want inside the chart.