How can calculate ( MSE , NMSE , Correlation Coefficient ) for the output result of neural network ?

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I want to calculate ( Mean Square Error , Normalized Mean Square Error , Correlation Coefficient ) for the output result of neural network using matlab code ...
the Data are a group of different images, its features were extracted using PCA and then entered into the Nueral Network.
How can I know about system performance ?
PLZ any help .. thanks
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Aya Ahmed
Aya Ahmed 2020년 8월 20일
Greg Heath the output is like that : -
three classes of images ,, i want to get there performance like Mean Square Error , Normalized Mean Square Error , Correlation Coefficient

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masoud sistaninejad
masoud sistaninejad 2021년 8월 4일
편집: masoud sistaninejad 2021년 8월 4일
inputs = x_test ; % your test data inputs
targets = y_test ; % your test data targets
P = net(inputs);
Error = targets - P;
MSE = mse(targets,P);
NMSE = (mean(error.^2)) / (mean(var(targets',1)));

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