Calculate False Acceptance and False Rejection Rates for a biometric system (MATLAB)

Question

I have a matrix called (all_output) (which is the output training and testing Neural Network of 36 users). This matrix contains 36 cells, each cell has

Answer 1

I am not sure what is your question but I cannot agree with your claim

EER simply can be calculated using this equation (FAR+FRR)/2

FAR (FRR) is not a value, it is a function dependent on threshold. EER is the value where FAR graph and FRR graph intersect as can be seen here.