Why do I get a cyclometric complexity of 2 for a switch block?

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MathWorks Support Team 2020-8-7

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回答： MathWorks Support Team 2020-8-7

I am running the "Cyclomatic complexity metric" check for a model which contains a switch block. Why do I get a Cyclometric complexity of 2?

My switch block has 1 decision point and 2 outcomes so the cyclometric complexity should be 1, but I am getting a complexity of 2. Please provide the reasoning behind this.

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Answer 1

MathWorks Support Team 2020-8-7

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https://ww2.mathworks.cn/matlabcentral/answers/576715-why-do-i-get-a-cyclometric-complexity-of-2-for-a-switch-block#answer_476752

cyclometricComplexity.png

As per the formula in the following documentation the cyclometric complexity for the block is computed individually as 1:

https://www.mathworks.com/help/slcheck/ref/model-metric-checks.html#buuybox-1

The formula is applied to every block in the model, so switch block gets a cyclometric complexity of 1 and default path in the model without the switch block adds another 1 for a total complexity of 2.