Can I generate a sequence diagram from an existing architecture in system composer?

I have a SW architecture with different interacting modules.

Right now, i can create the sequence diagram manually by dragging and dropping each module in ' Sequence Diagrams'

But I need to add the interacting ports manually.

Is there a way to create the sequence diagram with the interacting ports programmatically?

Answer 1

[Nithin]

Hi @SANDEEP VIKRAM,

It is possible to programmatically create sequence diagrams, add lifelines (modules) and interactions (messages or ports) using the "System Composer API". Refer to the following MATLAB documentation which explains the process of creating sequence diagram programmatically in detail: https://www.mathworks.com/help/systemcomposer/ug/create-sequence-diagrams-programmatically.html

You can also refer to the following MATLAB documentation to know more about the eacheach function used:

• Adding Lifelines: https://www.mathworks.com/help/systemcomposer/ref/systemcomposer.interaction.interaction.addlifeline.html
• Adding Fragments: https://www.mathworks.com/help/systemcomposer/ref/addfragment.html
• Adding Messages: https://www.mathworks.com/help/systemcomposer/ref/addmessage.html
• Adding Duration Constraints: https://www.mathworks.com/help/systemcomposer/ref/adddurationconstraint.html

Hope this answers your query.

[SANDEEP VIKRAM]

@Nithin But this API is available only for 2025a, right? Is there an option for 2023b?

[Les Beckham]

Based on those links, it looks like the ability to add Lifelines, Fragments, and Messages is available in 2024b, and Duration Constraints was added in 2025a.

[Nithin]

@SANDEEP VIKRAM, the feature of building sequence diagrams using programmatic interfaces was introduced in MATLAB R2024b. There is no documented way to do the same in R2023b.