Matlab built-in function not identified
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I am trying to use the function coefTest from the Statistics and Machine Learning Toolbox after calling the function I recive the error message
Undefined function or variable 'coefTest'.
I have checked that the statistics and machine learning toolbox is installed and enabled, has anybody else has an idea on how to further truble shoot this issue?
Thanks
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Risposte (2)
Bora Eryilmaz
il 3 Feb 2023
Modificato: Bora Eryilmaz
il 3 Feb 2023
coefTest is not a "function". It is a "method" of the LinearModel object/class. So, in order to call it, you need to create a linear model first. Something like this:
m = fitlm(array2table(rand(10,2)))
coefTest(m)
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Bora Eryilmaz
il 3 Feb 2023
Modificato: Bora Eryilmaz
il 3 Feb 2023
Seems to be working for me and here. It probably has something to do with the creation of a LinearModel that brings the help for the coefTest() method into scope:
help coefTest
Steven Lord
il 3 Feb 2023
Fresh start from MATLAB, "help coefTest" shows nothing but "doc coefTest" gives doc
That's correct. Not all classes in MATLAB are loaded into memory on MATLAB startup, IIRC. If the classes aren't loaded MATLAB won't know about the methods. Constructing an instance of a class makes MATLAB load the class definition into memory and I believe help looks at what's in memory. The doc function doesn't care what's in memory.
Steven Lord
il 3 Feb 2023
According to a search there are several different functions named coefTest in Statistics and Machine Learning Toolbox. From a quick scan of their documentation pages I believe the reason you're unable to call the function is that each of them requires that their first input is a certain type of object. If you were to try to call them with something other than one of those specific types of objects as the first input, MATLAB would not know to call that function.
coefTest(1:10) % won't work
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