How to make multiple sinc functions?

Hi, I found out from the forum that this is the code for generating one sinc function,

x = -5:.01:5;
plot(x,sinc(x))

Now, can I do multiple of these, like one after the other? But I need to change the frequency after every sinc cycle, is it possible? it will be like a chirp wave with sinc function. Any help will be appreciated, thanks.

Answer 1

[Image Analyst]

Do you mean like this:

x = -5:.01:5;
plot(x,sinc(x))
hold on
plot(x, sinc(x/3), 'r-');
plot(x, sinc(x/0.25), 'g-');

[Rohan Repale]

Ya like that, but can they follow each other on the time scale? Like the first wave goes at 10k, second follows it at 20k and so on?

[Image Analyst]

Just shift the x, like this:

x = -5:.01:5;
plot(x,sinc(x))
hold on
plot(x, sinc((x-2)/3), 'r-');
plot(x, sinc((x-4)/0.25), 'g-');

Answer 2

[Youssef Khmou]

hi,

Try the code provided by Image analyst, or try also this version :

 % different positions for peaks 
 x = -5:.01:5;
 center=[-2:0.2:2];
 for n=1:21
   M(:,n)=sinc(x-center(n));
 end
 plot(M)

[Rohan Repale]

Thanks Youssef, I can use parts of your code as well. However, I dont want it over lapping, it should follow one another. Like as soon as one gets over, other should start. I have an image but I don't know how attach images here.

[Youssef Khmou]

ok Rohan, in this case you need to enlarge the support axis try :

x=-30:0.1:30;
center=[-20:4:20];
for n=1:length(center)
 M(:,n)=sinc(x-center(n));
end 
plot(x,M), grid on,

If you want more separating distance, you can change the step in vector "center" from 4 to n>4 .

[Image Analyst]

sinc goes on forever, at least the theoretical formula for it because it's based on the sine function which goes on forever. Please say what criteria you want to use to decide where the sinc function "ends".