How can i add PSNR, MSError and SNR to my ready code?

Hello everyone, I’m doing research on an assignment that does LPC compression to a Speech file.

Here you see the code;

clear all;
clc;

%TAKING INPUT WAVEFILE,
a1 = 'C:\Users\user\Desktop\WAV\a1.wav';
[y, Fs] =audioread(a1); 
% x=wavrecord(,);
%LENGTH (IN SEC) OF INPUT WAVEFILE,
t=length(y)./Fs;
sprintf('Processing the wavefile "%s"', a1)
sprintf('The wavefile is  %3.2f  seconds long', t)
%THE ALGORITHM STARTS HERE,
M=10;  %prediction order
[aCoeff, pitch_plot, voiced, gain] = f_ENCODER(y, Fs, M);  %pitch_plot is pitch periods
synth_speech = f_DECODER (aCoeff, pitch_plot, voiced, gain);

Additionally, I want this code to calculate PSNR, MSError and SNR.

dis=numel(y)-numel(A2);
A2=[A2,zeros(1,dis)];
PSNR = psnr(A2,y)
MSError=mse(A2,y)
SNR=snr(A2,y)

I found such a code on the internet. But I don’t know what I should write instead of “A2” or for the others.

NOTE:-

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Here f_ENCODER code;

%ENCODER PORTION

%here,  fs = sampling frequency
%       aCoeff = LP coefficients
%       pitch = pitch periods
%       v = voiced or unvoiced decision bit
%       g = gain of frames
function [aCoeff, pitch_plot, voiced, gain] = f_ENCODER(x, fs, M);
if (nargin<3), M = 10; end   %prediction order=10; 

%INITIALIZATION;
b=1;        %index no. of starting data point of current frame
fsize = 30e-3;    %frame size
frame_length = round(fs .* fsize);   %=number data points in each framesize 
                                %of "x"
N= frame_length - 1;        %N+1 = frame length = number of data points in 
                            %each framesize
                            
%VOICED/UNVOICED and PITCH;     [independent of frame segmentation]
[voiced, pitch_plot] = f_VOICED (x, fs, fsize);
%FRAME SEGMENTATION for aCoeff and GAIN;

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How can i add PSNR, MSError and SNR to my ready code?

How can i add PSNR, MSError and SNR to my ready code?