MATLAB Answers

Certain functions not available.

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Stuart Hobson
Stuart Hobson 2019 年 7 月 11 日
Commented: Star Strider 2019 年 7 月 11 日
I have version R2017a under a "Designated Computer/Research Lab (accessed by multiple users)" license. This being an academic licence
I have however not been able to use certain functions I would have thought would be available for my use.
I thought it was just a once-off and never took note of which functions and can unfortunately cannot recall all the functions that I have had an issue with. I think in total it was about 3. So not many, however the one I note would be valuable to me. This last of these is the one I am able to present to you: 'ischange' cannot be used and is also not accessible to the 'help' function within matlab itself. I however have found various pages noting its use on the MathWorks site.
Is there perhaps a logical reason for this, perhaps something I may have done incorrectly?
Many thanks.

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Star Strider
Star Strider 2019 年 7 月 11 日
The ischange function was introduced in R2017b. Your best option would likely be to upgrade to a more recent release.
Workarounds may be possible otherwise, if you describe your problem. One such could be to use the Savitzky-Golay filter (sgolayfilt) to smooth your data, then detect changes in the filtered output to define your change points.

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Stuart Hobson
Stuart Hobson 2019 年 7 月 11 日
Many thanks! I will use your advice.
Star Strider
Star Strider 2019 年 7 月 11 日
As always, my pleasure!

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More Answers (1)

Guillaume
Guillaume 2019 年 7 月 11 日
The answer to why you cannot use ischange in R2017a is simple. As written at the bottom of its documentation, it was introduced in R2017b.
Perhaps the other functions you tried to use also required a later version. Or perhaps they require a toolbox that is not part of your license.
The type of license (academic/industrial/home/student) and whether it's TAHC, designated computer, designated user, etc. will not affect which function you have access to.

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Stuart Hobson
Stuart Hobson 2019 年 7 月 11 日
Many thanks!

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