What are the positions of the elements of the confusion matrix? How to calculate accuracy and fscore of the matrix of confusion using matlab?

For example, the confusion matrix (confMat) is: confMat(1,1) = 104, confMat(1,2) = 1242, confMat(2,1) = 14 and confMat(2,2) = 14199. In matalab using accuracy = mean(diag(confMat)) provides 0.5381. However, using the relation: accuracy=(TP+TN)/(TP+TN+FP+FN)=91.92. I have two classes and unbalanced dataset.

I believe the matrix of confusion in matlab is: confMat(1,1) = TN, confMat (1,2) = FP, confMat (2,1) = FN and confMat(2,2) = TP. Whereas: Horizontal = predicted class and Vertical = real class

Answer 1

[Morteza]

Your final belief is correct.