# How do I calculate the impulse response?

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dhanshri kulkarni il 26 Feb 2015
Risposto: Altanshagai il 10 Mar 2023
How do I write the code in order to get the impluse response for the following equation:
y[n]=x[n]+x[n-1]+x[n-2]
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### Risposta accettata

michael scheinfeild il 26 Feb 2015
f=100;% frequanecy
fs=1000;
n=[1:1000]*f/fs;
u=ones(n,1)
x(n)=2*cos(0.5*pi*n).u(n);
% ~ (check indexes im not sure ..)
y(n)=x(n(3:1000))+x(n(2:999))+x((1:998))
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Jens Kritian Poulsen il 2 Mar 2021
Modificato: Jens Kritian Poulsen il 2 Mar 2021
There are errors in the solution shown by Michael Scheinfeild, e.g. last line and it doesn't calculate the impulse response.
The solution by John D'Errico is okay (albeit a bit short)
The problem by itself is so simple you don't really need Matlab ([1 1 1] is the impulse response).

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### Più risposte (3)

John D'Errico il 26 Feb 2015
Use filter, or conv. WTP?
Compute the vector x, then get y from x.
y = conv(x,[1 1 1]);
and if x was [0 0 1 0 0], then what would y be from the above call to conv?
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MathWorks Support Team il 22 Mag 2019
To compute a 3 tap FIR filter impulse response, use “fft” with the corresponding coefficients. In this case,
>> fft([1 1 1])
Depending on the frequency resolution that you need, you will also have to specify the length of the transformation.
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Altanshagai il 10 Mar 2023
[1 1 1]
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