sampling and filtering using low pass filter

1. Sampling and filtering
clear all;
close all;
Am=10;
fm=6.283;
T=1/fm;
ncy=5;
t=0:T/999:ncy*1/fm;
m=Am*sin(2*pi*fm*t);
subplot(4,1,1);
grid minor
plot(t,m);
title('Continuous signal');
xlabel('time(s)');
ylabel('Amplitude(v)');
fs1=94.2477;
t1=0:1/fs1:1/fm*ncy;
m1=Am*sin(2*pi*fm*t1);
subplot(4,1,2);
plot(t1,m1);
hold on

2. stem(t1,m1);
title('fs>2fm');
xlabel('time(s)');
ylabel('Amplitude(v)');
fs2=25.132;
t2=0:1/fs2:1/fm*ncy;
m2=Am*sin(2*pi*fm*t2);
subplot(4,1,3);
plot(t2,m2);
hold on
stem(t2,m2);
title('fs=2fm');
xlabel('time(s)');
ylabel('Amplitude(v)');
fs3=4.283;
t3=0:1/fs3:1/fm*ncy;
m3=Am*sin(2*pi*fm*t3);
subplot(4,1,4);
plot(t3,m3);
hold on
stem(t3,m3);

3. title('fs<2fm');
xlabel('time(s)');
ylabel('Amplitude(v)');

4. simulink

5. output