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precision recall curve from Bag of Visual words classifier

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I have trained model using Bag of Visual words classifier for multi-class classification purpose. Though model produced confusion matrix for training and test phases. I want to produce precision-recall curve from these confusion matrix in matlab. I have saved workspace of my model as well. But dont know where to get points for precsion-recall plot? I need curve shown in given figure. Your help will be highy appreciated.

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Accepted Answer

Bernhard Suhm
Bernhard Suhm on 10 Mar 2019
You need to systematically vary the threshold (or related parameter) determining whether you accept or reject the detection. You can watch at 1:45 of this video explaining ROC curves.

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