Matlab : Flat top sampling using matlab

clear all;
close all;

p=0.001:.001:1;

o=ones(1,length(p));
z=zeros(1,length(p));

m=repmat([z o z o z o z o z o z o z o z o z o z o],[1,4]);

t=0.001:.001:length(m)/1000;

    y=.5*sin(t/10);
     

    x=y.*m;

    y1=x;
for i = 2:length(t)
    if m(i) == 1 && m(i-1) == 0 %if the rising edge is detected
        y1(i) = m(i) * y(i);    %sampling occurs
    elseif m(i) == 1 && m(i-1) == 1 %and while the carrier signal is 1
        y1(i) = y1(i-1);              %the value of y1 remains constant
    else
        y1(i) = 0;                %otherwise, y is zero
    end
end
 
   
subplot(3,1,1);
plot(t,y);

subplot(3,1,2);
plot(t,x);

subplot(3,1,3);
plot(t,y1);

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