How do I change the class label of the confusion matrix?

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tinkiewinkie 2020-3-5

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https://ww2.mathworks.cn/matlabcentral/answers/509213-how-do-i-change-the-class-label-of-the-confusion-matrix

评论： the cyclist 2022-9-17

Hi suppose I used the code below and the class label of the confusion matrix is 1,2,3. How to I change the class label to 'apple' , 'watermelon' and 'pear'?

cm = confusionchart([1 3 5; 2 4 6; 11 7 3]);
cm.Title = 'My Confusion Matrix Title';

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Answer 1

the cyclist 2020-3-5

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https://ww2.mathworks.cn/matlabcentral/answers/509213-how-do-i-change-the-class-label-of-the-confusion-matrix#answer_418719

编辑：the cyclist 2020-3-5

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According to the documentation:

cm = confusionchart([1 3 5; 2 4 6; 11 7 3],{'apple','watermelon','pear'});
cm.Title = 'My Confusion Matrix Title';

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Elysi Cochin 2022-9-17

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How will it work for the below line

confusionchart(trueClass, predictedClass);

The below code is showing error

cm = confusionchart(trueClass, predictedClass, {'Class1', 'Class2'});

the cyclist 2022-9-17

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Your case has an important difference from the original question, in that they had the confusion matrix already calculated. So, it works a bit differently.

For you, it depends on what does your data look like. You can work on characters directly.

trueClass = {'Class1','Class1','Class2','Class2'};

predictedClass = {'Class1','Class1','Class2','Class1'};

confusionchart(trueClass, predictedClass);

If your data are numeric, I think the easiest is to convert the input data into character arrays.

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