Why is the cyclomatic complexity measure for an If Action Subsystem block 0 in Simulink Verification and Validation 3.4 (R2012b)?

The cyclomatic complexity returned for an Atomic susbsytem is 1. However, the same measure is 0 for an If Action Subsystem block, which is also an atomic subsystem.

Answer 1

[MathWorks Support Team]

For a subsystem, the complexity measure returns an extra 1 when the 'treat as atomic unit' option is checked. This is because it is considered as a function call and it represents an implicit decision. There is an inconsistency in the way that complexity measure returned for an If Action Subsystem block is 0 as it is an atomic subsystem. There are no workarounds.