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problem in matlab Apps

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ahmad karim
ahmad karim 2017-1-30
关闭： MATLAB Answer Bot 2021-8-20
Hello,
assume i have data in the form of matrix when i want to classify it using Apps in matlab how can i determine the categories https://www.mathworks.com/videos/classify-data-using-the-classification-learner-app-106171.html in this tutorial not explain the classes (predicates)

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回答（1 个）

Walter Roberson
Walter Roberson 2017-1-30
The classes would have to be something you know ahead of time. To train a classifier, you need to have some known information about the classes of the data being trained on.
You might also have some data that you do not know the class for, that you want the classifier to figure out, but first you need some data that you do know the class for.
  2 个评论
ahmad karim
ahmad karim 2017-1-30
yes, i have data that that i know its classes but. how can i define that in matlab apps ? where i insert the classes?
Walter Roberson
Walter Roberson 2017-1-30
At the MATLAB level, create a single array that has the class number as one of the columns. In the Classification Learner App, import that variable, and mark the appropriate column as being the "response" variable.
If your class list is not numeric, then use one of these two patterns:
T = table(Data(:,1), Data(:,2), Data(:,3), ClassInformation(:));
or
T = [array2table(Data), array2table(ClassInformation(:))];
and then ask the classification app to import T; it will probably automatically detect the column as being the response variable.

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