How can I create a pulse train which is not periodic? A sample program has been attached.

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BIPIN SAMUEL on 2 Aug 2022
Commented: BIPIN SAMUEL on 3 Aug 2022
The matlab code shown below is for generating the pulse signal. However, when I try to plot 'b_n' the output I got is only first and the last shifted part. But I want to hold the in-between pulses also. The plotted figure is also shown below.
s=zeros(1,length(signal);
q=[q zeros(1,length(s)-length(q))];
a=s+q;
for i=1:length(f)
a_n=circshift(a,f(i)-20);
if i==1
b=a_n;
else
b_n=b+a_n;
end
b_n1=b_n;
end
figure();
plot(b_n)

Sam Chak on 2 Aug 2022
I followed an example in this link and modifed values of the parameters. Do you think it can be applied to your problem?
t = 0:1e-3:10;
d = [0:8:10]';
x = @rectpuls;
y = pulstran(t-1, d, x);
plot(t,y)
grid on
ylim([-0.5 1.5])
xlabel('Time (s)')
ylabel('Waveform')
BIPIN SAMUEL on 3 Aug 2022
Thank You @Sam Chak, but I need the shifted at variable intervals of samples not in time. You can see in my plot there is only two samples, however, I need 12 more pulses in-between that is shifted at different samples that are not periodic.