Matlab：perfcurve分数必须是浮点值的向量

Question

以下代码引发错误：您必须将分数作为浮点值的向量传递。

  [Yhat scores] = predict(svmModel, meas );
[X,Y,T,AUC] = perfcurve(Yhat ,scores,'1');

有人可以帮忙吗？

Answer 1

I can't provide deep help since I don't know what do you want to achieve exactly. BTW, I found you make a fundamental mistake by using single quotation with number one '1' since it recognized as charter not number. Therefore, it can match nothing with the array of numbers Yhat.

You can't use scores with two columns since the perfcurve(_) accept such a parameter with a single column only.

The code after apply the previous comments

% On full data
[Yhat, scores] = predict(svmModel, meas );
[X,Y,T,AUC] = perfcurve(Yhat ,abs(scores(:,2)),1);
plot(X,Y,'LineWidth',3)
xlabel('False positive rate')
ylabel('True positive rate')
title('ROC for Classification ')

The above code may not solve your issue but it will guide you to figure out your mistakes.