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Write a MATLAB program to sketch the following discrete-time signals in the time range of –10 ≤ n ≤ 10. Please label all the graph axes clearly. If the sequence is complex, plot the magnitude and angle separately. i) x(n) = u(n) – u(n – 3)

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Superman
Superman on 15 Sep 2015
Commented: Bhargav Jyoti Saikia on 27 Mar 2021 at 10:57
n=-10:10;
u(1:21)=ones(1,21); %creates a unit step sequence for u(n)
%how to write a delayed version of sequence i.e for u(n-3) ?

Answers (3)

Aliya Patel
Aliya Patel on 23 Nov 2018
t = (-10:1:10)'; %%Can change the interval time by replacing 1 with 0.1
step1 = t>=0; %% For u[n]
step2 = t>=3 %%For u[n-3]
x=step1-step2
plot(t,x) %%scatter can be used instead of plot
xlabel('time');
ylabel('amplitude');
title('x(n)=u(n)-u(n-3)');

Satadru Mukherjee
Satadru Mukherjee on 21 Mar 2020
Edited: Walter Roberson on 21 Mar 2020
n1=-10:10;
x=(n1>=0);
n2=n1+3;
y=x;
u=min(min(n1),min(n2));
t=max(max(n1),max(n2));
r=u:1:t;
z1=[];
temp=1;
for i=1:length(r)
if(r(i)<min(n1) || r(i)>max(n1))
z1=[z1 0];
else
z1=[z1 x(temp)];
temp=temp+1;
end
end
z2=[];
temp=1;
for i=1:length(r)
if(r(i)<min(n2) || r(i)>max(n2))
z2=[z2 0];
else
z2=[z2 y(temp)];
temp=temp+1;
end
end
z=z1-z2;
subplot(3,1,1);
stem(r,z1);
xlabel('Time sample');
ylabel('Amplitude');
title('First signal');
subplot(3,1,2);
stem(r,z2);
xlabel('Time sample');
ylabel('Amplitude');
title('Second signal');
subplot(3,1,3);
stem(r,z);
xlabel('Time sample');
ylabel('Amplitude');
title('Signal after Subtraction');
  5 Comments
Bhargav Jyoti Saikia
Bhargav Jyoti Saikia on 27 Mar 2021 at 10:57
Thank you very much. This program gave a clear idea as to how to implement these functions. Took little time to understand but after little debugging got the idea. There might be easier way or easier to understand simple method to achieve the same functionality.

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shreedevi Bovi
shreedevi Bovi on 25 Jan 2021
Using MATLAB command, find the energy of the given signal and compare the results with analytical calculations. 𝒙[𝒏] = { 𝒏, 𝟎 ≤ 𝑛 < 5 𝟏𝟎 − 𝒏, 𝟓 ≤ 𝑛 ≤ 10 𝟎 , 𝒐𝒕𝒉𝒆𝒓𝒘𝒊𝒔𝒆

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