How to draw the delta signal in matlab

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Juman Saleh
Juman Saleh 2023-3-27
回答： Carlos M. Velez S. 2025-7-24
I was trying to draw but I wasn't able to

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回答（3 个）

the cyclist
the cyclist 2023-3-27
编辑：the cyclist 2023-3-27
Do you mean the Dirac delta function? If so, then dirac might help you.
Also, if you do mean the Dirac delta, I hope you realize that it can't truly be "drawn", because it goes to infinity. It can be represented somehow (e.g. by drawing an arrow at the x location where the Delta is).
Star Strider
Star Strider 2023-3-28
Ran in:
The function normally will not plot in MATLAB because it has infinite amplitude and infinitesimal width.
So it is necessary to approximate it in ordfer to plot it —
t = linspace(0, 2, 21);
Delta = dirac(t - 1)
Delta = 1×21
0 0 0 0 0 0 0 0 0 0 Inf 0 0 0 0 0 0 0 0 0 0
idx = Delta == Inf;
Delta(idx) = 1;
figure
stem(t, Delta, 'filled')
axis('padded')
.
Carlos M. Velez S.
Carlos M. Velez S. 2025-7-24
If you want to apply the Dirac delta function in simulation to continuous-time systems, the following code is enough:
function y = delta_dirac(u)
[n,m] = size(u);
if max(n,m) ==1
dt = 1e-6; % Define a small time increment for the delta function
else
dt = u(2) - u(1);
end
y = zeros(n,m);
for i=1:max(m,n)
if u(i) == 0
y(i) = 1/dt;
else
y(i) = 0;
end
end

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