matlab code in digital communication

can you please explain the code for the above questions using the below code

clear all

% solution 6.5-1

% ==============

Given_Pr = [0.36 -1.2 0.21];

length_Pr = length(Given_Pr);

% Zero- clc

Forcing-Equalizer:

Pr_zf = toeplitz([Given_Pr([2:end]) zeros(1,2*1+1-length_Pr+1)], ...

[ Given_Pr([2:-1:1]) zeros(1,2*1+1-length_Pr+1) ]);

Po_zf = zeros(1,2*1+1);

Po_zf(2) = 1;

fprintf('solution 6.5-1 outputs are :\n');

C_val_ZF = [inv(Pr_zf)*Po_zf.'].'

mse_ZF = mse(C_val_ZF)

% solution 6.5-2

% ==============

Given_Pr = [0.36 -1.2 0.21];

length_Pr = length(Given_Pr);

K = 2;

N = 1;

% MMSE-Equalizer:

Pr_AutoCorr = conv(Given_Pr,fliplr(Given_Pr));

Pr_mmse = toeplitz([Pr_AutoCorr([3:end]) zeros(1,2*K+1-length_Pr)], ...

[ Pr_AutoCorr([3:end]) zeros(1,2*K+1-length_Pr) ]);

Pr_mmse = Pr_mmse + 1/2*10^(-1/10)*eye(2*K+1)*N;

Po_mmse = zeros(1,2*K+1);

Po_mmse([-1:1]+K+1) = fliplr(Given_Pr);

fprintf('\nsolution 6.5-2 outputs are :\n');

C_val_MMSE = [inv(Pr_mmse)*Po_mmse.'].'

mse_MMSE = mse(min(C_val_MMSE))