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How to compute the AUC (Area Under Curve)?

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How to compute the AUC (Area under Curve) when using the function
[tpr,fpr,thresholds] = roc(targets,outputs)
plot(fpr,tpr)

Accepted Answer

Askic V
Askic V on 9 Mar 2023
Edited: Askic V on 9 Mar 2023
I think this would be a correct way to do so, but I'm not 100% sure. It seems correct from the ROC diagrams:
[x,t] = iris_dataset;
net = patternnet(10);
net = train(net,x,t);
y = net(x);
[tpr,fpr,th] = roc(t,y);
plotroc(t, y)
auc_1 = 1-trapz(tpr{1}, fpr{1});
auc_2 = 1-trapz(tpr{2}, fpr{2});
auc_3 = 1-trapz(tpr{3}, fpr{3});

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