How do I replace the "classregtree" class and "eval" function in R2018a onwards?
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I used to use "eval" in MATLAB R2017b, but this triggers an error in R2018a. I have looked in the documentation but found no solution. Can you help?
Error using eval
Too many input arguments.
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MathWorks Support Team
2025-3-25
编辑：MathWorks Support Team
2025-3-25
That "eval" function was a method of the "classregtree" class which was removed in MATLAB R2018a. I noticed that you are now using the "fitctree" method instead of the removed "classregtree".
The trees from "fitctree" are part of the "ClassificationTree" class. A similar method to "eval" is in that class. It is called- "predict" and it predicts labels using classification tree. The third input in "predict" is slightly different than "eval", so you would need to change the inputs slightly.
Instead of:
>> eval(T, X, s)
The "predict" function should be used with the "Subtrees" Name-Value pair.
>> predict(T, X, 'Subtrees', s);
You can refer to the following MathWorks documentation for more information:
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2018-6-14
2025-3-25
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