Matlab built-in function not identified

조회 수: 8 (최근 30일)
Jacopo Cantoni
Jacopo Cantoni . 2023년 2월 3일
댓글: Steven Lord . 2023년 2월 3일
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

답변 (2개)

Bora Eryilmaz
Bora Eryilmaz 2023년 2월 3일
편집: Bora Eryilmaz 님. 2023년 2월 3일
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)))
m =
Linear regression model: Var2 ~ 1 + Var1 Estimated Coefficients: Estimate SE tStat pValue ________ _______ ________ ________ (Intercept) 0.80105 0.27121 2.9536 0.018324 Var1 -0.4655 0.48461 -0.96057 0.3649 Number of observations: 10, Error degrees of freedom: 8 Root Mean Squared Error: 0.327 R-squared: 0.103, Adjusted R-Squared: -0.00866 F-statistic vs. constant model: 0.923, p-value = 0.365
coefTest(m)
ans = 0.3649
  댓글 수: 3
Steven Lord
Steven Lord 2023년 2월 3일
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.

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Steven Lord
Steven Lord 2023년 2월 3일
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
Unrecognized function or variable 'coefTest'.

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