Needed SNR , PSNR, MSE, PSD matlab code for a ECG signal to recognize reconstructed ECG signal

Hello Friends,

I need very badly the SNR , PSNR, MSE, PSD matlab code to denoise the a noisy signal . I am trying more more but my supervisor is not happy for those code . I have used c code but she denied it . At this moment the code needed badly otherwise I will fail the lab exam . So plz any friends from here help me . Plz generate the accourding the equation not c code