It was introduced into the Signal Processing Toolbox in release R2016a, a later release than what you have.
Question
I am using Matlab version 2015b. I can use "cumsum", but not "cusum". Is it because of different version? >> help cusum cusum not found. Use the Help browser search field to search the documentation, or type "help help" for help command options, such as help for methods. Did you mean: >> help cumsum
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Answered Aug 17, 2026
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