how to solve this error "Undefined function 'crossvalind' for input arguments of type 'char'" while running below code in matlab 2019a

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%% Evaluate Accuracy
Accuracy_Percent= zeros(200,1);
for i = 1:500
data = Train_Feat;
%groups = ismember(Train_Label,1);
groups = ismember(Train_Label,0);
[train,test] = crossvalind('HoldOut',groups);
cp = classperf(groups);
%svmStruct =svmtrain(data(train,:),groups(train),'showplot',false,'kernel_function','linear');
svmStruct = fitcsvm(data(train,:),groups(train),'showplot',false,'kernel_function','linear');
%classes = svmclassify(svmStruct,data(test,:),'showplot',false);
classes = predict(svmStruct,data(test,:),'showplot',false);
Accuracy = cp.CorrectRate;
Accuracy_Percent(i) = Accuracy.*100;
Max_Accuracy = max(Accuracy_Percent);
sprintf('Accuracy of Linear Kernel with 500 iterations is: %g%%',Max_Accuracy)

Answers (1)

Gagan Baishya
Gagan Baishya on 17 Sep 2021
cvIndices = crossvalind(cvMethod,N,M)
returns the indices cvIndices after applying cvMethod on N observations using M as the selection parameter.
In your code, the third parameter is missing which is probably causing the issue. Try specifying the selection parameter (M) to avoid the error.

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