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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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) ?
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Antworten (3)
Aliya Patel
am 23 Nov. 2018
Bearbeitet: DGM
am 4 Nov. 2023
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)');
2 Kommentare
Satadru Mukherjee
am 21 Mär. 2020
This is wrong , your code is not taking care of the time index :-/
Satadru Mukherjee
am 21 Mär. 2020
Bearbeitet: Satadru Mukherjee
am 21 Mär. 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');
3 Kommentare
Walter Roberson
am 16 Mai 2020
It appends x(temp) to the end of z1. They wrote the code using that technique because people tend to learn the [] concatenation before they gain the experience to initialize an array to full size and write at a particular in the array.
Bhargav Jyoti Saikia
am 27 Mär. 2021
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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