where is the error of following code to calculate confusionmat?

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Rafid Mustafiz
Rafid Mustafiz 2018-9-22
回答： Snehal 2025-4-22
predictedLabels = predict(classifier, testFeatures);
testLabels = testSet.Labels;
confMat = confusionmat(testLabels, predictedLabels);
confMat = bsxfun(@rdivide,confMat,sum(confMat,2))
error is: G and GHAT need to have same number of rows

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回答（1 个）

Snehal
Snehal 2025-4-22
Hi @Rafid Mustafiz,
I see you are encountering an error while using ‘confusionmat’.  
This issue arises because MATLAB’s ‘confusionmat’ function requires both input vectors - the true labels and the predicted labels to have the same length and to correspond to the same set of data samples.
Consider checking your input parameters ‘testLabels’ and ‘predictedLabels’ before passing to ‘confusionmat’
Below is a sample code on how you can use ‘confusionmat’ function:
g1 = [3 2 2 3 1 1]'; % Known groups
g2 = [4 2 3 NaN 1 1]'; % Predicted groups
% note that g1 and g2 have same size
C = confusionmat(g1,g2)
You may refer to the following documentation for more information on ‘confusionmat’:
https://www.mathworks.com/help/stats/confusionmat.html 
Hope this helps!

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