Failed to Call Classification Learner's Testing Function

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Angga Lisdiyanto 2016-1-20

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/264459-failed-to-call-classification-learner-s-testing-function

评论：刘相志 2021-11-29

I was using a Matlab R2015b's Classification Learner Toolbox. I was successful in importing file data and export it into an Export Model, and i got a structure named trainedClassifier.

Import process #1

Import process #2

Training process with PCA implemented & Multi Class SVM (One vs All validation)

trainedClassifier variable generated from ToolBox

fetureVector variable which used for testing

yfit = trainedClassifier.predictFcn(featureVector)

After it, i want to doing a test with a new data with this code (i got this code from here ) :

>> yfit = trainedClassifier.predictFcn(featureVector)

Then i got an error output as a follows :

Function 'subsindex' is not defined for values of class 'cell'.
Error in mlearnapp.internal.model.DatasetSpecification>@(t)t(:,predictorNames) (line 135)
extractPredictorsFromTableFcn = @(t) t(:,predictorNames);
Error in  mlearnapp.internal.model.DatasetSpecification>@(x)extractPredictorsFromTableFcn(splitMatricesInTableFcn(convertMatrixToTableFcn(x)))
(line 136)
extractPredictorsFcn = @(x) extractPredictorsFromTableFcn(splitMatricesInTableFcn(convertMatrixToTableFcn(x)));
Error in mlearnapp.internal.model.DatasetSpecification>@(x)exportableClassifier.predictFcn(extractPredictorsFcn(x)) (line 137)
exportableClassifier.predictFcn = @(x) exportableClassifier.predictFcn(extractPredictorsFcn(x));

What is the problem and solutions?

Thanks in advance.

采纳的回答

Walter Roberson 2016-4-9

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https://ww2.mathworks.cn/matlabcentral/answers/264459-failed-to-call-classification-learner-s-testing-function#answer_217148

在 MATLAB Online 中打开

You have

yfit = trainedClassifier.predictFcn(featureVector)

and my reading just now suggest that perhaps needs to be

yfit = predict(trainedClassifier, featureVector)

The error message indicates that something is trying to be indexed using a cell array as a subscript, which is a valid indexing method for tables but not an indexing method for a double array.

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Anna Gerald 2018-6-28

编辑：Walter Roberson 2020-12-22

Please help in resolving these errors

Error using classreg.learning.internal.table2PredictMatrix>makeXMatrix (line 96) Table variable VarName1 is not a valid predictor.

Error in classreg.learning.internal.table2PredictMatrix (line 47) Xout = makeXMatrix(X,CategoricalPredictors,vrange,pnames);

Error in classreg.learning.regr.CompactRegressionTree/predict (line 557) X = classreg.learning.internal.table2PredictMatrix(X,[],[],...

Error in mlearnapp.internal.model.coremodel.TrainedRegressionTree>@(x)predict(RegressionTree,x) (line 46) functionHandle = @(x) predict(RegressionTree, x);

Error in mlearnapp.internal.model.transformation.TrainedManualFeatureSelection>@(x)decoratedPredictFunction(featureSelectionFunction(x)) (line 61) functionHandle = @(x) decoratedPredictFunction(featureSelectionFunction(x));

Error in mlearnapp.internal.model.DatasetSpecification>@(x)exportableModel.predictFcn(predictorExtractionFcn(x)) (line 167) newExportableModel.predictFcn = @(x) exportableModel.predictFcn(predictorExtractionFcn(x));

Error in copy (line 3) yfit = trainedModel1.predictFcn(FV_table)