MATLAB: What is the difference between “<>“, “!=” and “~=” in a Stateflow chart

!=~=cchart;stateflow

I have a Stateflow chart where the symbol "<>" is used. I tried to replace this symbol with "!=" but it seems to give identical results. What is the risk of change in behavior of the model or of the generated code if all "<>" are placed with "!=" ?

Best Answer

The "<>" symbol is indeed equivalent to "!=". Nevertheless, it would be more robust to replace both of these expressions with "~=".

This is because, both "<>" and "!=" are binary operations which are only supported when using C as the action language of the chart:

https://www.mathworks.com/help/stateflow/ug/supported-operations-on-chart-data.html

On the other hand, "~=" is supported both when using MATLAB or C as the action language.

For more information about using MATLAB or C as an action language see:

https://www.mathworks.com/help/stateflow/ug/differences-between-matlab-and-stateflow-action-language.html

Related Solutions

MATLAB: What does the operator “~=” mean

something(somthing_else)=0; In MATLAB refers to logical indexing and assignment.

In this case somthing_else has to be logical (think boolean) and

im ~= immax

basically means values where those to are not equal will be true and the rest will be false. When that is followed by:

im(im ~= immax) = 0;

you are equating to zero all the values in im where the above condition is not satisfied.

you will find this information in the documentation under logical indexing.

MATLAB: How to programmatically add an annotation/note with a hyperlink to a Stateflow chart

This can be done by the following example code:

>> sfnew
>> rt = sfroot;
>> c = rt.find('-isa','Stateflow.Chart');
>> a = Stateflow.Annotation(c);
>> a.Interpretation = 'RICH';
>> a.Text = '<html><body><a href="www.mathworks.com">try this</a></body></html>'

In all releases (older releases) which use Stateflow.Note instead of Stateflow.Annotation, it is possible to accomplish the same thing, you just have to use

>> a = Stateflow.Note(c);

for the constructor.

If you want to add MATLAB Code to the hyperlink, please modify the above mentioned HTML Code in a.Text.

Here you can find how to do this:

https://mathworks.com/help/matlab/matlab_prog/create-hyperlinks-that-run-functions.html

Best Answer

Related Solutions

MATLAB: What does the operator “~=” mean

MATLAB: How to programmatically add an annotation/note with a hyperlink to a Stateflow chart

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