Hi Haotian,
As per my understanding, you have given the same sort of inputs to the confusionmat function and plotconfusion function.
Confusionmat function takes input as known groups and predicted groups and returns the confusion matrix,
Whereas plotconfusion function plots a confusion matrix for the true labels targets and predicted labels outputs.
As a workaround you can plot the confusion matrix using confusionchart.
Execute the code and you will get the results as expected.
A = [1;2;3;4;1;1;2;3;4;1;1;2;2;3];
B = [1;2;3;3;2;1;2;3;4;1;4;2;2;3];
C =confusionmat (A,B);
confusionchart(C); % to plot the confusion matrix
Hope this Helps!
