String Class for Confusion Matrix

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Angga Lisdiyanto
Angga Lisdiyanto 2016-5-12
回答： Angga Lisdiyanto 2016-6-6
Hi, my code is like below :
predictors = [apple apple watermelon watermelon orange orange];
validationPredictions = [apple apple apple apple orange apple];
confuseMatrix = confusionmat(predictors, validationPredictions);
Where :
  • predictors = Class names (string data type) of data training.
  • validationPredictions = Class names (string data type) as a result of classification.
What i know is, confusionmat need for integer value type for both of True Class and Predict Class.
I got error for running my code above, it seems the data must a integer but my classes is string. How to solve this?
If possible, i need a Confusion Matrix like this (taken from Classification Learner App Toolbox) :
  2 个评论
Tom Lane
Tom Lane 2016-5-19
If I run this right before your code:
apple = {'apple'}; watermelon = {'watermelon'}; orange = {'orange'};
then I get a matrix result with no error. How did you define these variables? What release of MATLAB are you using?
Angga Lisdiyanto
Angga Lisdiyanto 2016-5-21
编辑：Angga Lisdiyanto 2016-5-21
My variable is a matrix, not a cell. Now is ok with cell type, thanks.
I am using Matlab R2015b.
But how to give a string label?
It is very confusing if we read CM without X or Y tick class/variables.

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Angga Lisdiyanto
Angga Lisdiyanto 2016-6-6
Okay, i got a solution. The solution is by using confMatPlot function from Matlab's File Exchange .

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