MATLAB: Failed to Call Classification Learner’s Testing Function

Question

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.

Answer 1

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.