Moving Average Filter using MATLAB

%moving average filter
clear all;
close all;
clc;
fs=500000;
fm=10000;
t=1:200;
x=5*cos(2*pi*(fm/fs)*t);
z=awgn(x,5); % adding White Gaussian noise to the input with S/N=5
plot(x,'g','linewidth',1.5);
hold on;
plot(z);
hold on;
for i=1:194;
y(i)=(z(i)+z(i+1)+z(i+2)+z(i+3)+z(i+4)+z(i+6))/6;
end
plot(y,'r','linewidth',1.5);
legend('Actual','Noisy','Filtered');
title('moving Average Filter','fontsize',12);
xlabel('---> time in 2us');
ylabel('---> volts'); 

OUTPUT:                                                                                            A Book to learn MATLAB