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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sabiya fatima
sabiya fatima 2020-7-29
评论： Walter Roberson 2021-9-17
%% Evaluate Accuracy
load('Accuracy_Data.mat')
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);
classperf(cp,classes,test);
Accuracy = cp.CorrectRate;
Accuracy_Percent(i) = Accuracy.*100;
end
Max_Accuracy = max(Accuracy_Percent);
sprintf('Accuracy of Linear Kernel with 500 iterations is: %g%%',Max_Accuracy)

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回答（1 个）

Gagan Baishya
Gagan Baishya 2021-9-17
Hello,
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.
For better understanding, please go through the documentation link below: https://in.mathworks.com/help/bioinfo/ref/crossvalind.html#:~:text=evaluation%20each%20time.-,%27HoldOut%27,-M%20is%20the

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