RMSE, R square question calculation

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sam vikum 2016-12-2

i have my confusion matrix as C.mat

  20    39
     3826  14
     7    4431

My predicted class labels are Ypred and actual labels are Ytest. Ypred size is 16000*1 and Ytest 16000*1

I am trying to calculate the R sqaure and RMSE and I defined the following:

rmse = sqrt(immse(Ypred, Ytest));

I also tried to use the built in function to generate R SQUARE between two vectors

mdl=fitlm(Ypred,Ytest,'linear')

But both didnt work. Is there something I am missing?

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