Programatically create a new Stateflow chart inside an existing subsystem

The following concerns versions 2020b and 2024b.

I'm creating a code importer that parses XML to generate a model within simulink. The XML encodes regular interconnected logic gates, numerical comparitors, conditionals, etc arranged in subsystems. This all works fine. One subsystem contains a Stateflow chart and this is where I fall down.

I can create a new sf chart using the sfnew command, but this creates a new chart in a new window. I can't see anyway of telling it to create a chart object in a defined subsystem. I also can't see a way of even telling sfnew to create a new chart silently, without spawning a new window. I want to do all this in memory withou windows popping in and out of existance.

I have tried commands similar to the following,

>> modelName = 'flow_demo';
>> open_system(modelName);
>> subsystemPath = [modelName,'/Subsystem'];
>> add_block('built-in/Subsystem', subsystemPath);
>> subsystemHandle = get_param(subsystemPath, 'Handle');
>> chart = Stateflow.Chart(subsystemHandle);

but I get the following error message:

Error using Stateflow.Chart
No constructor 'Stateflow.Chart' with matching signature found.

Out of despiration I also tried add_block, but met with the error 'There is no block named 'Stateflow/Chart''

So how can I create a new stateflow chart silently, similar to 'add_block('built-in/Subsystem', subsystemPath);'?

After this point the APIs allow me to manipulate the the chart as I need.

Thanks.

Answer 1

[Fangjun Jiang]

Use below to add a new Stateflow chart block and then use Stateflow API.

add_block('sflib/Chart','MyModel/MySubSystem/MyChart')

Usually, start with below to find the handle of the Stateflow chart

ch = find(sfroot,"-isa","Stateflow.Chart")

https://www.mathworks.com/help/releases/R2024b/stateflow/api/quick-start-for-the-stateflow-api.html